21337243007 has 4 divisors (see below), whose sum is σ = 21532997640. Its totient is φ = 21141488376.

The previous prime is 21337242989. The next prime is 21337243019. The reversal of 21337243007 is 70034273312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21337243007 - 2¹⁶ = 21337177471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337243097) 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, 97877153 + ... + 97877370.

It is an arithmetic number, because the mean of its divisors is an integer number (5383249410).

Almost surely, 2^21337243007 is an apocalyptic number.

21337243007 is a deficient number, since it is larger than the sum of its proper divisors (195754633).

21337243007 is a wasteful number, since it uses less digits than its factorization.

21337243007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195754632.

The product of its (nonzero) digits is 21168, while the sum is 32.

The spelling of 21337243007 in words is "twenty-one billion, three hundred thirty-seven million, two hundred forty-three thousand, seven".