21016107069 has 4 divisors (see below), whose sum is σ = 28021476096. Its totient is φ = 14010738044.

The previous prime is 21016107061. The next prime is 21016107097. The reversal of 21016107069 is 96070161012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21016107069 - 2³ = 21016107061 is a prime.

It is a super-2 number, since 2×21016107069² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016107061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3502684509 + ... + 3502684514.

It is an arithmetic number, because the mean of its divisors is an integer number (7005369024).

Almost surely, 2^21016107069 is an apocalyptic number.

It is an amenable number.

21016107069 is a deficient number, since it is larger than the sum of its proper divisors (7005369027).

21016107069 is an equidigital number, since it uses as much as digits as its factorization.

21016107069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7005369026.

The product of its (nonzero) digits is 4536, while the sum is 33.

The spelling of 21016107069 in words is "twenty-one billion, sixteen million, one hundred seven thousand, sixty-nine".