21002102021204 has 24 divisors (see below), whose sum is σ = 36767449961088. Its totient is φ = 10497117061440.

The previous prime is 21002102021189. The next prime is 21002102021227. The reversal of 21002102021204 is 40212020120012.

It is a super-2 number, since 2×21002102021204² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 120084629 + ... + 120259395.

It is an arithmetic number, because the mean of its divisors is an integer number (1531977081712).

Almost surely, 2^{21002102021204} is an apocalyptic number.

It is an amenable number.

21002102021204 is a deficient number, since it is larger than the sum of its proper divisors (15765347939884).

21002102021204 is a wasteful number, since it uses less digits than its factorization.

21002102021204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185855 (or 185853 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002102021204 its reverse (40212020120012), we get a palindrome (61214122141216).

The spelling of 21002102021204 in words is "twenty-one trillion, two billion, one hundred two million, twenty-one thousand, two hundred four".