21142647257734 has 16 divisors (see below), whose sum is σ = 32024867041440. Its totient is φ = 10467710766720.

The previous prime is 21142647257731. The next prime is 21142647257741. The reversal of 21142647257734 is 43775274624112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142647257731) 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, 2585907 + ... + 6998014.

It is an arithmetic number, because the mean of its divisors is an integer number (2001554190090).

Almost surely, 2^{21142647257734} is an apocalyptic number.

21142647257734 is a deficient number, since it is larger than the sum of its proper divisors (10882219783706).

21142647257734 is a wasteful number, since it uses less digits than its factorization.

21142647257734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9594735.

The product of its digits is 15805440, while the sum is 55.

The spelling of 21142647257734 in words is "twenty-one trillion, one hundred forty-two billion, six hundred forty-seven million, two hundred fifty-seven thousand, seven hundred thirty-four".