20132690021 has 2 divisors, whose sum is σ = 20132690022. Its totient is φ = 20132690020.

The previous prime is 20132689957. The next prime is 20132690057. The reversal of 20132690021 is 12009623102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17999173921 + 2133516100 = 134161^2 + 46190^2 .

It is a cyclic number.

It is not a de Polignac number, because 20132690021 - 2⁶ = 20132689957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20132690321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10066345010 + 10066345011.

It is an arithmetic number, because the mean of its divisors is an integer number (10066345011).

Almost surely, 2^20132690021 is an apocalyptic number.

It is an amenable number.

20132690021 is a deficient number, since it is larger than the sum of its proper divisors (1).

20132690021 is an equidigital number, since it uses as much as digits as its factorization.

20132690021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 26.

The spelling of 20132690021 in words is "twenty billion, one hundred thirty-two million, six hundred ninety thousand, twenty-one".