21002616634 has 8 divisors (see below), whose sum is σ = 31599103968. Its totient is φ = 10469581980.

The previous prime is 21002616631. The next prime is 21002616647. The reversal of 21002616634 is 43661620012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21002616634² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002616596 and 21002616605.

It is not an unprimeable number, because it can be changed into a prime (21002616631) 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, 15862342 + ... + 15863665.

It is an arithmetic number, because the mean of its divisors is an integer number (3949887996).

Almost surely, 2^21002616634 is an apocalyptic number.

21002616634 is a deficient number, since it is larger than the sum of its proper divisors (10596487334).

21002616634 is a wasteful number, since it uses less digits than its factorization.

21002616634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31726340.

The product of its (nonzero) digits is 10368, while the sum is 31.

The spelling of 21002616634 in words is "twenty-one billion, two million, six hundred sixteen thousand, six hundred thirty-four".