212237156394 has 32 divisors (see below), whose sum is σ = 484385106240. Its totient is φ = 68833671696.

The previous prime is 212237156371. The next prime is 212237156399. The reversal of 212237156394 is 493651732212.

It is a happy number.

212237156394 is a `hidden beast` number, since 2 + 1 + 2 + 2 + 3 + 7 + 1 + 5 + 639 + 4 = 666.

It is a super-2 number, since 2×212237156394² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212237156399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53110404 + ... + 53114399.

It is an arithmetic number, because the mean of its divisors is an integer number (15137034570).

Almost surely, 2^212237156394 is an apocalyptic number.

212237156394 is an abundant number, since it is smaller than the sum of its proper divisors (272147949846).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

212237156394 is a wasteful number, since it uses less digits than its factorization.

212237156394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106224851 (or 106224845 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 212237156394 in words is "two hundred twelve billion, two hundred thirty-seven million, one hundred fifty-six thousand, three hundred ninety-four".