212685437551 has 16 divisors (see below), whose sum is σ = 223181743104. Its totient is φ = 202296451104.

The previous prime is 212685437527. The next prime is 212685437561. The reversal of 212685437551 is 155734586212.

It is a cyclic number.

It is not a de Polignac number, because 212685437551 - 2⁹ = 212685437039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 212685437495 and 212685437504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212685437561) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2892721 + ... + 2965333.

It is an arithmetic number, because the mean of its divisors is an integer number (13948858944).

Almost surely, 2^212685437551 is an apocalyptic number.

212685437551 is a deficient number, since it is larger than the sum of its proper divisors (10496305553).

212685437551 is a wasteful number, since it uses less digits than its factorization.

212685437551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73350.

The product of its digits is 2016000, while the sum is 49.

The spelling of 212685437551 in words is "two hundred twelve billion, six hundred eighty-five million, four hundred thirty-seven thousand, five hundred fifty-one".