21010221122010 has 64 divisors (see below), whose sum is σ = 53900240728320. Its totient is φ = 5228418398720.

The previous prime is 21010221121961. The next prime is 21010221122039. The reversal of 21010221122010 is 1022112201012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 371308245 + ... + 371364824.

It is an arithmetic number, because the mean of its divisors is an integer number (842191261380).

Almost surely, 2^{21010221122010} is an apocalyptic number.

21010221122010 is an abundant number, since it is smaller than the sum of its proper divisors (32890019606310).

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

21010221122010 is a wasteful number, since it uses less digits than its factorization.

21010221122010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742673143.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21010221122010 its reverse (1022112201012), we get a palindrome (22032333323022).

The spelling of 21010221122010 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, one hundred twenty-two thousand, ten".