21113023153621 has 16 divisors (see below), whose sum is σ = 24150249446400. Its totient is φ = 18081071849088.

The previous prime is 21113023153609. The next prime is 21113023153657. The reversal of 21113023153621 is 12635132031112.

It is a cyclic number.

It is not a de Polignac number, because 21113023153621 - 2⁷ = 21113023153493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113023153681) 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, 51727740 + ... + 52134298.

It is an arithmetic number, because the mean of its divisors is an integer number (1509390590400).

Almost surely, 2^{21113023153621} is an apocalyptic number.

It is an amenable number.

21113023153621 is a deficient number, since it is larger than the sum of its proper divisors (3037226292779).

21113023153621 is a wasteful number, since it uses less digits than its factorization.

21113023153621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413028.

The product of its (nonzero) digits is 6480, while the sum is 31.

Adding to 21113023153621 its reverse (12635132031112), we get a palindrome (33748155184733).

The spelling of 21113023153621 in words is "twenty-one trillion, one hundred thirteen billion, twenty-three million, one hundred fifty-three thousand, six hundred twenty-one".