20667225121 has 9 divisors (see below), whose sum is σ = 20790001561. Its totient is φ = 20545172032.

The previous prime is 20667225107. The next prime is 20667225127. The reversal of 20667225121 is 12152276602.

The square root of 20667225121 is 143761.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 13326162721 + 7341062400 = 115439^2 + 85680^2 .

It is not a de Polignac number, because 20667225121 - 2²⁵ = 20633670689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20667225127) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33496005 + ... + 33496621.

Almost surely, 2^20667225121 is an apocalyptic number.

20667225121 is the 143761-st square number.

20667225121 is the 71881-st centered octagonal number.

It is an amenable number.

20667225121 is a deficient number, since it is larger than the sum of its proper divisors (122776440).

20667225121 is an frugal number, since it uses more digits than its factorization.

20667225121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1700 (or 850 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 20667225121 in words is "twenty billion, six hundred sixty-seven million, two hundred twenty-five thousand, one hundred twenty-one".