211401023657 has 4 divisors (see below), whose sum is σ = 211442585856. Its totient is φ = 211359461460.

The previous prime is 211401023591. The next prime is 211401023693. The reversal of 211401023657 is 756320104112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211401023657 - 2²⁶ = 211333914793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211401029657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20773469 + ... + 20783642.

It is an arithmetic number, because the mean of its divisors is an integer number (52860646464).

Almost surely, 2^211401023657 is an apocalyptic number.

It is an amenable number.

211401023657 is a deficient number, since it is larger than the sum of its proper divisors (41562199).

211401023657 is an equidigital number, since it uses as much as digits as its factorization.

211401023657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41562198.

The product of its (nonzero) digits is 10080, while the sum is 32.

Adding to 211401023657 its reverse (756320104112), we get a palindrome (967721127769).

The spelling of 211401023657 in words is "two hundred eleven billion, four hundred one million, twenty-three thousand, six hundred fifty-seven".