212170651551 has 48 divisors (see below), whose sum is σ = 323336133120. Its totient is φ = 133803109440.

The previous prime is 212170651531. The next prime is 212170651579. The reversal of 212170651551 is 155156071212.

212170651551 is a `hidden beast` number, since 2 + 1 + 21 + 70 + 6 + 515 + 51 = 666.

It is not a de Polignac number, because 212170651551 - 2⁹ = 212170651039 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212170651501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12333366 + ... + 12350556.

It is an arithmetic number, because the mean of its divisors is an integer number (6736169440).

Almost surely, 2^212170651551 is an apocalyptic number.

212170651551 is a deficient number, since it is larger than the sum of its proper divisors (111165481569).

212170651551 is a wasteful number, since it uses less digits than its factorization.

212170651551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17876 (or 17873 counting only the distinct ones).

The product of its (nonzero) digits is 21000, while the sum is 36.

The spelling of 212170651551 in words is "two hundred twelve billion, one hundred seventy million, six hundred fifty-one thousand, five hundred fifty-one".