21142101420 has 288 divisors, whose sum is σ = 76186656000. Its totient is φ = 4687925760.

The previous prime is 21142101419. The next prime is 21142101427. The reversal of 21142101420 is 2410124112.

21142101420 is a `hidden beast` number, since 2 + 1 + 142 + 101 + 420 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21142101393 and 21142101402.

It is not an unprimeable number, because it can be changed into a prime (21142101427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1081291 + ... + 1100669.

It is an arithmetic number, because the mean of its divisors is an integer number (264537000).

Almost surely, 2^21142101420 is an apocalyptic number.

21142101420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142101420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38093328000).

21142101420 is an abundant number, since it is smaller than the sum of its proper divisors (55044554580).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21142101420 is a wasteful number, since it uses less digits than its factorization.

21142101420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19453 (or 19448 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21142101420 its reverse (2410124112), we get a palindrome (23552225532).

The spelling of 21142101420 in words is "twenty-one billion, one hundred forty-two million, one hundred one thousand, four hundred twenty".