21022452161 has 12 divisors (see below), whose sum is σ = 22351564800. Its totient is φ = 19768334400.

The previous prime is 21022452151. The next prime is 21022452163. The reversal of 21022452161 is 16125422012.

It is a de Polignac number, because none of the positive numbers 2^k-21022452161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21022452161.

It is not an unprimeable number, because it can be changed into a prime (21022452163) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 301040 + ... + 364238.

It is an arithmetic number, because the mean of its divisors is an integer number (1862630400).

Almost surely, 2^21022452161 is an apocalyptic number.

It is an amenable number.

21022452161 is a deficient number, since it is larger than the sum of its proper divisors (1329112639).

21022452161 is a wasteful number, since it uses less digits than its factorization.

21022452161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64384 (or 64367 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 21022452161 its reverse (16125422012), we get a palindrome (37147874173).

The spelling of 21022452161 in words is "twenty-one billion, twenty-two million, four hundred fifty-two thousand, one hundred sixty-one".