202100020691 has 2 divisors, whose sum is σ = 202100020692. Its totient is φ = 202100020690.

The previous prime is 202100020649. The next prime is 202100020799. The reversal of 202100020691 is 196020001202.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-202100020691 is a prime.

It is not a weakly prime, because it can be changed into another prime (202100020621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101050010345 + 101050010346.

It is an arithmetic number, because the mean of its divisors is an integer number (101050010346).

Almost surely, 2^202100020691 is an apocalyptic number.

202100020691 is a deficient number, since it is larger than the sum of its proper divisors (1).

202100020691 is an equidigital number, since it uses as much as digits as its factorization.

202100020691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 202100020691 its reverse (196020001202), we get a palindrome (398120021893).

The spelling of 202100020691 in words is "two hundred two billion, one hundred million, twenty thousand, six hundred ninety-one".