21022011221010 has 128 divisors (see below), whose sum is σ = 52837878320640. Its totient is φ = 5342644893696.

The previous prime is 21022011220979. The next prime is 21022011221051. The reversal of 21022011221010 is 1012211022012.

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 63 ways as a sum of consecutive naturals, for example, 1231004592 + ... + 1231021668.

It is an arithmetic number, because the mean of its divisors is an integer number (412795924380).

Almost surely, 2^{21022011221010} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21022011221010, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26418939160320).

21022011221010 is an abundant number, since it is smaller than the sum of its proper divisors (31815867099630).

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

21022011221010 is a wasteful number, since it uses less digits than its factorization.

21022011221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23492.

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

Adding to 21022011221010 its reverse (1012211022012), we get a palindrome (22034222243022).

The spelling of 21022011221010 in words is "twenty-one trillion, twenty-two billion, eleven million, two hundred twenty-one thousand, ten".