21021002022210 has 16 divisors (see below), whose sum is σ = 50450404853376. Its totient is φ = 5605600539248.

The previous prime is 21021002022197. The next prime is 21021002022233. The reversal of 21021002022210 is 1222020012012.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 21021002022210.

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, 350350033674 + ... + 350350033733.

It is an arithmetic number, because the mean of its divisors is an integer number (3153150303336).

Almost surely, 2^{21021002022210} is an apocalyptic number.

21021002022210 is an abundant number, since it is smaller than the sum of its proper divisors (29429402831166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21021002022210 is a wasteful number, since it uses less digits than its factorization.

21021002022210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700700067417.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21021002022210 its reverse (1222020012012), we get a palindrome (22243022034222).

The spelling of 21021002022210 in words is "twenty-one trillion, twenty-one billion, two million, twenty-two thousand, two hundred ten".