21602171016 has 32 divisors (see below), whose sum is σ = 60006031200. Its totient is φ = 7200723600.

The previous prime is 21602170999. The next prime is 21602171033. The reversal of 21602171016 is 61017120612.

It is a happy number.

21602171016 is a `hidden beast` number, since 21 + 602 + 17 + 10 + 16 = 666.

It is an interprime number because it is at equal distance from previous prime (21602170999) and next prime (21602171033).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50004810 + ... + 50005241.

It is an arithmetic number, because the mean of its divisors is an integer number (1875188475).

Almost surely, 2^21602171016 is an apocalyptic number.

It is an amenable number.

21602171016 is an abundant number, since it is smaller than the sum of its proper divisors (38403860184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21602171016 is a wasteful number, since it uses less digits than its factorization.

21602171016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100010066 (or 100010056 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

Adding to 21602171016 its reverse (61017120612), we get a palindrome (82619291628).

The spelling of 21602171016 in words is "twenty-one billion, six hundred two million, one hundred seventy-one thousand, sixteen".