212222865 has 16 divisors (see below), whose sum is σ = 345964608. Its totient is φ = 111049536.

The previous prime is 212222851. The next prime is 212222893. The reversal of 212222865 is 568222212.

It is not a de Polignac number, because 212222865 - 2⁵ = 212222833 is a prime.

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, 132679 + ... + 134268.

It is an arithmetic number, because the mean of its divisors is an integer number (21622788).

Almost surely, 2^212222865 is an apocalyptic number.

It is an amenable number.

212222865 is a deficient number, since it is larger than the sum of its proper divisors (133741743).

212222865 is a wasteful number, since it uses less digits than its factorization.

212222865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267008.

The product of its digits is 7680, while the sum is 30.

The square root of 212222865 is about 14567.8709837780. The cubic root of 212222865 is about 596.4820666653.

It can be divided in two parts, 21 and 2222865, that added together give a triangular number (2222886 = T₂₁₀₈).

The spelling of 212222865 in words is "two hundred twelve million, two hundred twenty-two thousand, eight hundred sixty-five".