21002120002 has 32 divisors (see below), whose sum is σ = 33206482944. Its totient is φ = 9949651200.

The previous prime is 21002119987. The next prime is 21002120081. The reversal of 21002120002 is 20002120012.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 603127 + ... + 636997.

It is an arithmetic number, because the mean of its divisors is an integer number (1037702592).

Almost surely, 2^21002120002 is an apocalyptic number.

21002120002 is a deficient number, since it is larger than the sum of its proper divisors (12204362942).

21002120002 is a wasteful number, since it uses less digits than its factorization.

21002120002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34114.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21002120002 its sum of digits (10), we get a palindrome (21002120012).

Adding to 21002120002 its reverse (20002120012), we get a palindrome (41004240014).

The spelling of 21002120002 in words is "twenty-one billion, two million, one hundred twenty thousand, two".