21364715734121 has 4 divisors (see below), whose sum is σ = 21367771772544. Its totient is φ = 21361659695700.

The previous prime is 21364715734057. The next prime is 21364715734157. The reversal of 21364715734121 is 12143751746312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21364715734121 - 2⁶ = 21364715734057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21364715734421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1528008725 + ... + 1528022706.

It is an arithmetic number, because the mean of its divisors is an integer number (5341942943136).

Almost surely, 2^{21364715734121} is an apocalyptic number.

It is an amenable number.

21364715734121 is a deficient number, since it is larger than the sum of its proper divisors (3056038423).

21364715734121 is an equidigital number, since it uses as much as digits as its factorization.

21364715734121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3056038422.

The product of its digits is 846720, while the sum is 47.

The spelling of 21364715734121 in words is "twenty-one trillion, three hundred sixty-four billion, seven hundred fifteen million, seven hundred thirty-four thousand, one hundred twenty-one".