211564640452 has 24 divisors (see below), whose sum is σ = 404472362112. Its totient is φ = 96028548000.

The previous prime is 211564640437. The next prime is 211564640459. The reversal of 211564640452 is 254046465112.

It is not an unprimeable number, because it can be changed into a prime (211564640459) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3398748 + ... + 3460435.

It is an arithmetic number, because the mean of its divisors is an integer number (16853015088).

Almost surely, 2^211564640452 is an apocalyptic number.

211564640452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

211564640452 is a deficient number, since it is larger than the sum of its proper divisors (192907721660).

211564640452 is a wasteful number, since it uses less digits than its factorization.

211564640452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6859899 (or 6859897 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 40.

The spelling of 211564640452 in words is "two hundred eleven billion, five hundred sixty-four million, six hundred forty thousand, four hundred fifty-two".