21020002121204 has 48 divisors (see below), whose sum is σ = 41177800238400. Its totient is φ = 9330224288256.

The previous prime is 21020002121189. The next prime is 21020002121213. The reversal of 21020002121204 is 40212120002012.

It is a Harshad number since it is a multiple of its sum of digits (17).

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 15 ways as a sum of consecutive naturals, for example, 35226734 + ... + 35818469.

It is an arithmetic number, because the mean of its divisors is an integer number (857870838300).

Almost surely, 2^{21020002121204} is an apocalyptic number.

It is an amenable number.

21020002121204 is a deficient number, since it is larger than the sum of its proper divisors (20157798117196).

21020002121204 is a wasteful number, since it uses less digits than its factorization.

21020002121204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71045472 (or 71045470 counting only the distinct ones).

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

Adding to 21020002121204 its reverse (40212120002012), we get a palindrome (61232122123216).

The spelling of 21020002121204 in words is "twenty-one trillion, twenty billion, two million, one hundred twenty-one thousand, two hundred four".