212166454 has 16 divisors (see below), whose sum is σ = 321527808. Its totient is φ = 104994792.

The previous prime is 212166401. The next prime is 212166469. The reversal of 212166454 is 454661212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 148387 + ... + 149809.

It is an arithmetic number, because the mean of its divisors is an integer number (20095488).

Almost surely, 2^212166454 is an apocalyptic number.

212166454 is a deficient number, since it is larger than the sum of its proper divisors (109361354).

212166454 is a wasteful number, since it uses less digits than its factorization.

212166454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2139.

The product of its digits is 11520, while the sum is 31.

The square root of 212166454 is about 14565.9347108244. The cubic root of 212166454 is about 596.4292116448.

The spelling of 212166454 in words is "two hundred twelve million, one hundred sixty-six thousand, four hundred fifty-four".