21021210002 has 24 divisors (see below), whose sum is σ = 34264723824. Its totient is φ = 9667769904.

The previous prime is 21021209983. The next prime is 21021210029. The reversal of 21021210002 is 20001212012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14228 + ... + 205535.

It is an arithmetic number, because the mean of its divisors is an integer number (1427696826).

Almost surely, 2^21021210002 is an apocalyptic number.

21021210002 is a deficient number, since it is larger than the sum of its proper divisors (13243513822).

21021210002 is a wasteful number, since it uses less digits than its factorization.

21021210002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220074 (or 220061 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21021210002 its reverse (20001212012), we get a palindrome (41022422014).

The spelling of 21021210002 in words is "twenty-one billion, twenty-one million, two hundred ten thousand, two".