21621201461022 has 16 divisors (see below), whose sum is σ = 43389987918480. Its totient is φ = 7182469654272.

The previous prime is 21621201461017. The next prime is 21621201461023. The reversal of 21621201461022 is 22016410212612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21621201461023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6149372947 + ... + 6149376462.

It is an arithmetic number, because the mean of its divisors is an integer number (2711874244905).

Almost surely, 2^{21621201461022} is an apocalyptic number.

21621201461022 is an abundant number, since it is smaller than the sum of its proper divisors (21768786457458).

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

21621201461022 is a wasteful number, since it uses less digits than its factorization.

21621201461022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12298749707.

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 21621201461022 its reverse (22016410212612), we get a palindrome (43637611673634).

The spelling of 21621201461022 in words is "twenty-one trillion, six hundred twenty-one billion, two hundred one million, four hundred sixty-one thousand, twenty-two".