212131551 has 8 divisors (see below), whose sum is σ = 282929920. Its totient is φ = 141377112.

The previous prime is 212131547. The next prime is 212131567. The reversal of 212131551 is 155131212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212131551 - 2² = 212131547 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 (212131501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2736 + ... + 20778.

It is an arithmetic number, because the mean of its divisors is an integer number (35366240).

Almost surely, 2^212131551 is an apocalyptic number.

212131551 is a deficient number, since it is larger than the sum of its proper divisors (70798369).

212131551 is a wasteful number, since it uses less digits than its factorization.

212131551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21965.

The product of its digits is 300, while the sum is 21.

The square root of 212131551 is about 14564.7365578647. The cubic root of 212131551 is about 596.3965041330.

Adding to 212131551 its reverse (155131212), we get a palindrome (367262763).

The spelling of 212131551 in words is "two hundred twelve million, one hundred thirty-one thousand, five hundred fifty-one".