212137721705 has 16 divisors (see below), whose sum is σ = 313311097344. Its totient is φ = 134276184000.

The previous prime is 212137721701. The next prime is 212137721707. The reversal of 212137721705 is 507127731212.

It is not a de Polignac number, because 212137721705 - 2² = 212137721701 is a prime.

It is not an unprimeable number, because it can be changed into a prime (212137721701) 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, 233117921 + ... + 233118830.

It is an arithmetic number, because the mean of its divisors is an integer number (19581943584).

Almost surely, 2^212137721705 is an apocalyptic number.

It is an amenable number.

212137721705 is a deficient number, since it is larger than the sum of its proper divisors (101173375639).

212137721705 is a wasteful number, since it uses less digits than its factorization.

212137721705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466236776.

The product of its (nonzero) digits is 41160, while the sum is 38.

The spelling of 212137721705 in words is "two hundred twelve billion, one hundred thirty-seven million, seven hundred twenty-one thousand, seven hundred five".