212917965 has 16 divisors (see below), whose sum is σ = 366874368. Its totient is φ = 104821056.

The previous prime is 212917927. The next prime is 212917973. The reversal of 212917965 is 569719212.

It is not a de Polignac number, because 212917965 - 2¹⁰ = 212916941 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 545749 + ... + 546138.

It is an arithmetic number, because the mean of its divisors is an integer number (22929648).

Almost surely, 2^212917965 is an apocalyptic number.

It is an amenable number.

212917965 is a deficient number, since it is larger than the sum of its proper divisors (153956403).

212917965 is a wasteful number, since it uses less digits than its factorization.

212917965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1091908.

The product of its digits is 68040, while the sum is 42.

The square root of 212917965 is about 14591.7087758768. The cubic root of 212917965 is about 597.1325822443.

The spelling of 212917965 in words is "two hundred twelve million, nine hundred seventeen thousand, nine hundred sixty-five".