21521122337 has 8 divisors (see below), whose sum is σ = 25283556480. Its totient is φ = 18059682960.

The previous prime is 21521122309. The next prime is 21521122351. The reversal of 21521122337 is 73322112512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21521122337 - 2⁸ = 21521122081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21521125337) 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, 75248537 + ... + 75248822.

It is an arithmetic number, because the mean of its divisors is an integer number (3160444560).

Almost surely, 2^21521122337 is an apocalyptic number.

It is an amenable number.

21521122337 is a deficient number, since it is larger than the sum of its proper divisors (3762434143).

21521122337 is a wasteful number, since it uses less digits than its factorization.

21521122337 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150497383.

The product of its digits is 5040, while the sum is 29.

Adding to 21521122337 its reverse (73322112512), we get a palindrome (94843234849).

The spelling of 21521122337 in words is "twenty-one billion, five hundred twenty-one million, one hundred twenty-two thousand, three hundred thirty-seven".