20974296121 has 2 divisors, whose sum is σ = 20974296122. Its totient is φ = 20974296120.

The previous prime is 20974296103. The next prime is 20974296131. The reversal of 20974296121 is 12169247902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20210602896 + 763693225 = 142164^2 + 27635^2 .

It is a cyclic number.

It is not a de Polignac number, because 20974296121 - 2⁵ = 20974296089 is a prime.

It is not a weakly prime, because it can be changed into another prime (20974296131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10487148060 + 10487148061.

It is an arithmetic number, because the mean of its divisors is an integer number (10487148061).

Almost surely, 2^20974296121 is an apocalyptic number.

It is an amenable number.

20974296121 is a deficient number, since it is larger than the sum of its proper divisors (1).

20974296121 is an equidigital number, since it uses as much as digits as its factorization.

20974296121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The spelling of 20974296121 in words is "twenty billion, nine hundred seventy-four million, two hundred ninety-six thousand, one hundred twenty-one".