21002420012 has 24 divisors (see below), whose sum is σ = 42376570656. Its totient is φ = 8921380608.

The previous prime is 21002420009. The next prime is 21002420017.

21002420012 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×21002420012² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is not an unprimeable number, because it can be changed into a prime (21002420017) 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, 3315803 + ... + 3322130.

It is an arithmetic number, because the mean of its divisors is an integer number (1765690444).

Almost surely, 2^21002420012 is an apocalyptic number.

It is an amenable number.

21002420012 is an abundant number, since it is smaller than the sum of its proper divisors (21374150644).

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

21002420012 is a wasteful number, since it uses less digits than its factorization.

21002420012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6638057 (or 6638055 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 14.

The spelling of 21002420012 in words is "twenty-one billion, two million, four hundred twenty thousand, twelve".