21002500212 has 24 divisors (see below), whose sum is σ = 51585088800. Its totient is φ = 6632368416.

The previous prime is 21002500157. The next prime is 21002500219. The reversal of 21002500212 is 21200520012.

It is a super-2 number, since 2×21002500212² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21002500191 and 21002500200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21002500219) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46057887 + ... + 46058342.

It is an arithmetic number, because the mean of its divisors is an integer number (2149378700).

Almost surely, 2^21002500212 is an apocalyptic number.

It is an amenable number.

21002500212 is an abundant number, since it is smaller than the sum of its proper divisors (30582588588).

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

21002500212 is a wasteful number, since it uses less digits than its factorization.

21002500212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92116255 (or 92116253 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The spelling of 21002500212 in words is "twenty-one billion, two million, five hundred thousand, two hundred twelve".