21621404031535 has 32 divisors (see below), whose sum is σ = 32348449142784. Its totient is φ = 13478035200000.

The previous prime is 21621404031457. The next prime is 21621404031589. The reversal of 21621404031535 is 53513040412612.

It is not a de Polignac number, because 21621404031535 - 2¹³ = 21621404023343 is a prime.

It is a super-2 number, since 2×21621404031535² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21621404031494 and 21621404031503.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22235535 + ... + 23187535.

It is an arithmetic number, because the mean of its divisors is an integer number (1010889035712).

Almost surely, 2^{21621404031535} is an apocalyptic number.

21621404031535 is a deficient number, since it is larger than the sum of its proper divisors (10727045111249).

21621404031535 is a wasteful number, since it uses less digits than its factorization.

21621404031535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1011015.

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 21621404031535 in words is "twenty-one trillion, six hundred twenty-one billion, four hundred four million, thirty-one thousand, five hundred thirty-five".