21222672737 has 4 divisors (see below), whose sum is σ = 24254483136. Its totient is φ = 18190862340.

The previous prime is 21222672727. The next prime is 21222672739. The reversal of 21222672737 is 73727622212.

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 not a de Polignac number, because 21222672737 - 2¹⁰ = 21222671713 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222672694 and 21222672703.

It is not an unprimeable number, because it can be changed into a prime (21222672739) 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, 1515905189 + ... + 1515905202.

It is an arithmetic number, because the mean of its divisors is an integer number (6063620784).

Almost surely, 2^21222672737 is an apocalyptic number.

It is an amenable number.

21222672737 is a deficient number, since it is larger than the sum of its proper divisors (3031810399).

21222672737 is an equidigital number, since it uses as much as digits as its factorization.

21222672737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3031810398.

The product of its digits is 197568, while the sum is 41.

The spelling of 21222672737 in words is "twenty-one billion, two hundred twenty-two million, six hundred seventy-two thousand, seven hundred thirty-seven".