212191972 has 12 divisors (see below), whose sum is σ = 372678460. Its totient is φ = 105712416.

The previous prime is 212191963. The next prime is 212192041. The reversal of 212191972 is 279191212.

It is a happy number.

212191972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 76143076 + 136048896 = 8726^2 + 11664^2 .

It is a super-3 number, since 3×212191972³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94647 + ... + 96862.

Almost surely, 2^212191972 is an apocalyptic number.

It is an amenable number.

212191972 is a deficient number, since it is larger than the sum of its proper divisors (160486488).

212191972 is a wasteful number, since it uses less digits than its factorization.

212191972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191790 (or 191788 counting only the distinct ones).

The product of its digits is 4536, while the sum is 34.

The square root of 212191972 is about 14566.8106323931. The cubic root of 212191972 is about 596.4531222273.

The spelling of 212191972 in words is "two hundred twelve million, one hundred ninety-one thousand, nine hundred seventy-two".