21211021002 has 16 divisors (see below), whose sum is σ = 42423989760. Its totient is φ = 7070015712.

The previous prime is 21211020977. The next prime is 21211021003. The reversal of 21211021002 is 20012011212.

It is not an unprimeable number, because it can be changed into a prime (21211021003) 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, 87318 + ... + 223710.

It is an arithmetic number, because the mean of its divisors is an integer number (2651499360).

Almost surely, 2^21211021002 is an apocalyptic number.

21211021002 is an abundant number, since it is smaller than the sum of its proper divisors (21212968758).

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

21211021002 is a wasteful number, since it uses less digits than its factorization.

21211021002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162317.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21211021002 its reverse (20012011212), we get a palindrome (41223032214).

The spelling of 21211021002 in words is "twenty-one billion, two hundred eleven million, twenty-one thousand, two".