212387202551 has 4 divisors (see below), whose sum is σ = 212674601400. Its totient is φ = 212099803704.

The previous prime is 212387202539. The next prime is 212387202563. The reversal of 212387202551 is 155202783212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (212387202539) and next prime (212387202563).

It is a cyclic number.

It is not a de Polignac number, because 212387202551 - 2¹⁸ = 212386940407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212387202581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143698316 + ... + 143699793.

It is an arithmetic number, because the mean of its divisors is an integer number (53168650350).

Almost surely, 2^212387202551 is an apocalyptic number.

212387202551 is a deficient number, since it is larger than the sum of its proper divisors (287398849).

212387202551 is an equidigital number, since it uses as much as digits as its factorization.

212387202551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287398848.

The product of its (nonzero) digits is 67200, while the sum is 38.

Adding to 212387202551 its reverse (155202783212), we get a palindrome (367589985763).

The spelling of 212387202551 in words is "two hundred twelve billion, three hundred eighty-seven million, two hundred two thousand, five hundred fifty-one".