20210957957 has 2 divisors, whose sum is σ = 20210957958. Its totient is φ = 20210957956.

The previous prime is 20210957929. The next prime is 20210957971. The reversal of 20210957957 is 75975901202.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18932108836 + 1278849121 = 137594^2 + 35761^2 .

It is a cyclic number.

It is not a de Polignac number, because 20210957957 - 2¹⁶ = 20210892421 is a prime.

It is a super-2 number, since 2×20210957957² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20210957857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105478978 + 10105478979.

It is an arithmetic number, because the mean of its divisors is an integer number (10105478979).

Almost surely, 2^20210957957 is an apocalyptic number.

It is an amenable number.

20210957957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20210957957 is an equidigital number, since it uses as much as digits as its factorization.

20210957957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 47.

The spelling of 20210957957 in words is "twenty billion, two hundred ten million, nine hundred fifty-seven thousand, nine hundred fifty-seven".