21364171520622 has 32 divisors (see below), whose sum is σ = 49968029075712. Its totient is φ = 5962094377344.

The previous prime is 21364171520621. The next prime is 21364171520639. The reversal of 21364171520622 is 22602517146312.

It is a happy number.

It is a super-2 number, since 2×21364171520622² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21364171520621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5914774363 + ... + 5914777974.

It is an arithmetic number, because the mean of its divisors is an integer number (1561500908616).

Almost surely, 2^{21364171520622} is an apocalyptic number.

21364171520622 is an abundant number, since it is smaller than the sum of its proper divisors (28603857555090).

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

21364171520622 is a wasteful number, since it uses less digits than its factorization.

21364171520622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11829552392.

The product of its (nonzero) digits is 241920, while the sum is 42.

Adding to 21364171520622 its reverse (22602517146312), we get a palindrome (43966688666934).

The spelling of 21364171520622 in words is "twenty-one trillion, three hundred sixty-four billion, one hundred seventy-one million, five hundred twenty thousand, six hundred twenty-two".