22729154621 has 2 divisors, whose sum is σ = 22729154622. Its totient is φ = 22729154620.

The previous prime is 22729154597. The next prime is 22729154629. The reversal of 22729154621 is 12645192722.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19175325625 + 3553828996 = 138475^2 + 59614^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22729154621 is a prime.

It is a super-2 number, since 2×22729154621² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22729154629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11364577310 + 11364577311.

It is an arithmetic number, because the mean of its divisors is an integer number (11364577311).

Almost surely, 2^22729154621 is an apocalyptic number.

It is an amenable number.

22729154621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22729154621 is an equidigital number, since it uses as much as digits as its factorization.

22729154621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The spelling of 22729154621 in words is "twenty-two billion, seven hundred twenty-nine million, one hundred fifty-four thousand, six hundred twenty-one".