211412665921 has 4 divisors (see below), whose sum is σ = 211510862532. Its totient is φ = 211314469312.

The previous prime is 211412665913. The next prime is 211412666011. The reversal of 211412665921 is 129566214112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13476655921 + 197936010000 = 116089^2 + 444900^2 .

It is a cyclic number.

It is not a de Polignac number, because 211412665921 - 2³ = 211412665913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211412665901) 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, 49095076 + ... + 49099381.

It is an arithmetic number, because the mean of its divisors is an integer number (52877715633).

Almost surely, 2^211412665921 is an apocalyptic number.

It is an amenable number.

211412665921 is a deficient number, since it is larger than the sum of its proper divisors (98196611).

211412665921 is an equidigital number, since it uses as much as digits as its factorization.

211412665921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98196610.

The product of its digits is 51840, while the sum is 40.

The spelling of 211412665921 in words is "two hundred eleven billion, four hundred twelve million, six hundred sixty-five thousand, nine hundred twenty-one".