21016271502 has 96 divisors (see below), whose sum is σ = 49023636480. Its totient is φ = 6740703360.

The previous prime is 21016271491. The next prime is 21016271509. The reversal of 21016271502 is 20517261012.

21016271502 is a `hidden beast` number, since 21 + 0 + 1 + 627 + 15 + 0 + 2 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21016271509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2692918 + ... + 2700710.

It is an arithmetic number, because the mean of its divisors is an integer number (510662880).

Almost surely, 2^21016271502 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21016271502, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24511818240).

21016271502 is an abundant number, since it is smaller than the sum of its proper divisors (28007364978).

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

21016271502 is a wasteful number, since it uses less digits than its factorization.

21016271502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8020 (or 8008 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The spelling of 21016271502 in words is "twenty-one billion, sixteen million, two hundred seventy-one thousand, five hundred two".