21142101402 has 96 divisors (see below), whose sum is σ = 47603322000. Its totient is φ = 6776193024.

The previous prime is 21142101373. The next prime is 21142101419. The reversal of 21142101402 is 20410124112.

21142101402 is a `hidden beast` number, since 21 + 142 + 101 + 402 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 17819847081 + 3322254321 = 133491^2 + 57639^2 .

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

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 25502724 + ... + 25503552.

Almost surely, 2^21142101402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21142101402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23801661000).

21142101402 is an abundant number, since it is smaller than the sum of its proper divisors (26461220598).

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

21142101402 is a wasteful number, since it uses less digits than its factorization.

21142101402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280 (or 1277 counting only the distinct ones).

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

Adding to 21142101402 its reverse (20410124112), we get a palindrome (41552225514).

The spelling of 21142101402 in words is "twenty-one billion, one hundred forty-two million, one hundred one thousand, four hundred two".