213722405721 has 12 divisors (see below), whose sum is σ = 336774700080. Its totient is φ = 129528730680.

The previous prime is 213722405719. The next prime is 213722405761. The reversal of 213722405721 is 127504227312.

213722405721 is a `hidden beast` number, since 2 + 13 + 72 + 2 + 4 + 0 + 572 + 1 = 666.

213722405721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213722405721 - 2¹ = 213722405719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (213722405761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1079405991 + ... + 1079406188.

It is an arithmetic number, because the mean of its divisors is an integer number (28064558340).

Almost surely, 2^213722405721 is an apocalyptic number.

It is an amenable number.

213722405721 is a deficient number, since it is larger than the sum of its proper divisors (123052294359).

213722405721 is a wasteful number, since it uses less digits than its factorization.

213722405721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2158812196 (or 2158812193 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 36.

The spelling of 213722405721 in words is "two hundred thirteen billion, seven hundred twenty-two million, four hundred five thousand, seven hundred twenty-one".