20101001210957 has 2 divisors, whose sum is σ = 20101001210958. Its totient is φ = 20101001210956.

The previous prime is 20101001210951. The next prime is 20101001211041. The reversal of 20101001210957 is 75901210010102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20100570689956 + 430521001 = 4483366^2 + 20749^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101001210957 - 2¹² = 20101001206861 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101001210951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050500605478 + 10050500605479.

It is an arithmetic number, because the mean of its divisors is an integer number (10050500605479).

Almost surely, 2^{20101001210957} is an apocalyptic number.

It is an amenable number.

20101001210957 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101001210957 is an equidigital number, since it uses as much as digits as its factorization.

20101001210957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 29.

The spelling of 20101001210957 in words is "twenty trillion, one hundred one billion, one million, two hundred ten thousand, nine hundred fifty-seven".