21142020040000 has 140 divisors (see below), whose sum is σ = 52506934827424. Its totient is φ = 8443645632000.

The previous prime is 21142020039967. The next prime is 21142020040003. The reversal of 21142020040000 is 4002024112.

It is a super-2 number, since 2×21142020040000² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142020040003) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25308997 + ... + 26131003.

Almost surely, 2^{21142020040000} is an apocalyptic number.

21142020040000 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 21142020040000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26253467413712).

21142020040000 is an abundant number, since it is smaller than the sum of its proper divisors (31364914787424).

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

21142020040000 is an frugal number, since it uses more digits than its factorization.

21142020040000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822682 (or 822657 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21142020040000 its reverse (4002024112), we get a palindrome (21146022064112).

The spelling of 21142020040000 in words is "twenty-one trillion, one hundred forty-two billion, twenty million, forty thousand".