20125526644121 has 2 divisors, whose sum is σ = 20125526644122. Its totient is φ = 20125526644120.

The previous prime is 20125526644103. The next prime is 20125526644187. The reversal of 20125526644121 is 12144662552102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15103172238400 + 5022354405721 = 3886280^2 + 2241061^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20125526644121 is a prime.

It is not a weakly prime, because it can be changed into another prime (20125526644021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062763322060 + 10062763322061.

It is an arithmetic number, because the mean of its divisors is an integer number (10062763322061).

Almost surely, 2^{20125526644121} is an apocalyptic number.

It is an amenable number.

20125526644121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125526644121 is an equidigital number, since it uses as much as digits as its factorization.

20125526644121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 230400, while the sum is 41.

The spelling of 20125526644121 in words is "twenty trillion, one hundred twenty-five billion, five hundred twenty-six million, six hundred forty-four thousand, one hundred twenty-one".