22153412521 has 4 divisors (see below), whose sum is σ = 23456554452. Its totient is φ = 20850270592.

The previous prime is 22153412507. The next prime is 22153412531. The reversal of 22153412521 is 12521435122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19343246400 + 2810166121 = 139080^2 + 53011^2 .

It is a cyclic number.

It is not a de Polignac number, because 22153412521 - 2⁹ = 22153412009 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 22153412521.

It is not an unprimeable number, because it can be changed into a prime (22153412531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 651570940 + ... + 651570973.

It is an arithmetic number, because the mean of its divisors is an integer number (5864138613).

Almost surely, 2^22153412521 is an apocalyptic number.

It is an amenable number.

22153412521 is a deficient number, since it is larger than the sum of its proper divisors (1303141931).

22153412521 is a wasteful number, since it uses less digits than its factorization.

22153412521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1303141930.

The product of its digits is 4800, while the sum is 28.

Adding to 22153412521 its reverse (12521435122), we get a palindrome (34674847643).

The spelling of 22153412521 in words is "twenty-two billion, one hundred fifty-three million, four hundred twelve thousand, five hundred twenty-one".