212155005 has 32 divisors (see below), whose sum is σ = 345744000. Its totient is φ = 111071232.

The previous prime is 212154983. The next prime is 212155061. The reversal of 212155005 is 500551212.

It is not a de Polignac number, because 212155005 - 2⁶ = 212154941 is a prime.

It is a super-2 number, since 2×212155005² = 90019492293100050, which contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 201721 + ... + 202769.

It is an arithmetic number, because the mean of its divisors is an integer number (10804500).

Almost surely, 2^212155005 is an apocalyptic number.

It is an amenable number.

212155005 is a deficient number, since it is larger than the sum of its proper divisors (133588995).

212155005 is a wasteful number, since it uses less digits than its factorization.

212155005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1293.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 212155005 is about 14565.5416995043. The cubic root of 212155005 is about 596.4184832116.

The spelling of 212155005 in words is "two hundred twelve million, one hundred fifty-five thousand, five".