12002021957 has 2 divisors, whose sum is σ = 12002021958. Its totient is φ = 12002021956.

The previous prime is 12002021869. The next prime is 12002021971. The reversal of 12002021957 is 75912020021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10689698881 + 1312323076 = 103391^2 + 36226^2 .

It is a cyclic number.

It is not a de Polignac number, because 12002021957 - 2²⁰ = 12000973381 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12002021657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6001010978 + 6001010979.

It is an arithmetic number, because the mean of its divisors is an integer number (6001010979).

Almost surely, 2^12002021957 is an apocalyptic number.

It is an amenable number.

12002021957 is a deficient number, since it is larger than the sum of its proper divisors (1).

12002021957 is an equidigital number, since it uses as much as digits as its factorization.

12002021957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

Adding to 12002021957 its reverse (75912020021), we get a palindrome (87914041978).

The spelling of 12002021957 in words is "twelve billion, two million, twenty-one thousand, nine hundred fifty-seven".