212451155 has 16 divisors (see below), whose sum is σ = 291639744. Its totient is φ = 145541760.

The previous prime is 212451143. The next prime is 212451167. The reversal of 212451155 is 551154212.

It is an interprime number because it is at equal distance from previous prime (212451143) and next prime (212451167).

It is not a de Polignac number, because 212451155 - 2¹⁸ = 212189011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45845 + ... + 50265.

It is an arithmetic number, because the mean of its divisors is an integer number (18227484).

Almost surely, 2^212451155 is an apocalyptic number.

212451155 is a deficient number, since it is larger than the sum of its proper divisors (79188589).

212451155 is a wasteful number, since it uses less digits than its factorization.

212451155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5806.

The product of its digits is 2000, while the sum is 26.

The square root of 212451155 is about 14575.7042711493. The cubic root of 212451155 is about 596.6958703529.

The spelling of 212451155 in words is "two hundred twelve million, four hundred fifty-one thousand, one hundred fifty-five".