37858397021 has 2 divisors, whose sum is σ = 37858397022. Its totient is φ = 37858397020.

The previous prime is 37858396963. The next prime is 37858397029. The reversal of 37858397021 is 12079385873.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30222084025 + 7636312996 = 173845^2 + 87386^2 .

It is a cyclic number.

It is not a de Polignac number, because 37858397021 - 2³⁰ = 36784655197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (37858397029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18929198510 + 18929198511.

It is an arithmetic number, because the mean of its divisors is an integer number (18929198511).

Almost surely, 2^37858397021 is an apocalyptic number.

It is an amenable number.

37858397021 is a deficient number, since it is larger than the sum of its proper divisors (1).

37858397021 is an equidigital number, since it uses as much as digits as its factorization.

37858397021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 37858397021 in words is "thirty-seven billion, eight hundred fifty-eight million, three hundred ninety-seven thousand, twenty-one".