21137622241 has 4 divisors (see below), whose sum is σ = 21205589184. Its totient is φ = 21069655300.

The previous prime is 21137622239. The next prime is 21137622263. The reversal of 21137622241 is 14222673112.

It is a happy number.

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 21137622241 - 2¹ = 21137622239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21137652241) 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, 33983005 + ... + 33983626.

It is an arithmetic number, because the mean of its divisors is an integer number (5301397296).

Almost surely, 2^21137622241 is an apocalyptic number.

It is an amenable number.

21137622241 is a deficient number, since it is larger than the sum of its proper divisors (67966943).

21137622241 is an equidigital number, since it uses as much as digits as its factorization.

21137622241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67966942.

The product of its digits is 8064, while the sum is 31.

The spelling of 21137622241 in words is "twenty-one billion, one hundred thirty-seven million, six hundred twenty-two thousand, two hundred forty-one".