21621272113735 has 32 divisors (see below), whose sum is σ = 30431398161024. Its totient is φ = 14437668096000.

The previous prime is 21621272113709. The next prime is 21621272113747. The reversal of 21621272113735 is 53731127212612.

It is not a de Polignac number, because 21621272113735 - 2⁹ = 21621272113223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21621272113691 and 21621272113700.

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, 13148886 + ... + 14701555.

It is an arithmetic number, because the mean of its divisors is an integer number (950981192532).

Almost surely, 2^{21621272113735} is an apocalyptic number.

21621272113735 is a deficient number, since it is larger than the sum of its proper divisors (8810126047289).

21621272113735 is a wasteful number, since it uses less digits than its factorization.

21621272113735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27851035.

The product of its digits is 211680, while the sum is 43.

The spelling of 21621272113735 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred seventy-two million, one hundred thirteen thousand, seven hundred thirty-five".