21113505102040 has 64 divisors (see below), whose sum is σ = 51354170683200. Its totient is φ = 7766114022912.

The previous prime is 21113505101917. The next prime is 21113505102049. The reversal of 21113505102040 is 4020150531112.

It is a super-2 number, since 2×21113505102040² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21113505101996 and 21113505102014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113505102049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 77055055 + ... + 77328574.

It is an arithmetic number, because the mean of its divisors is an integer number (802408916925).

Almost surely, 2^{21113505102040} is an apocalyptic number.

21113505102040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21113505102040 is an abundant number, since it is smaller than the sum of its proper divisors (30240665581160).

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

21113505102040 is a wasteful number, since it uses less digits than its factorization.

21113505102040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154383916 (or 154383912 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 21113505102040 its reverse (4020150531112), we get a palindrome (25133655633152).

The spelling of 21113505102040 in words is "twenty-one trillion, one hundred thirteen billion, five hundred five million, one hundred two thousand, forty".