21221210002102 has 16 divisors (see below), whose sum is σ = 34725974657472. Its totient is φ = 9645905021320.

The previous prime is 21221210002061. The next prime is 21221210002127. The reversal of 21221210002102 is 20120001212212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2773888 + ... + 7080739.

It is an arithmetic number, because the mean of its divisors is an integer number (2170373416092).

Almost surely, 2^{21221210002102} is an apocalyptic number.

21221210002102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21221210002102 is a deficient number, since it is larger than the sum of its proper divisors (13504764655370).

21221210002102 is a wasteful number, since it uses less digits than its factorization.

21221210002102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9952523.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21221210002102 its reverse (20120001212212), we get a palindrome (41341211214314).

The spelling of 21221210002102 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred ten million, two thousand, one hundred two".