21126722073 has 8 divisors (see below), whose sum is σ = 28169634528. Its totient is φ = 14084145504.

The previous prime is 21126722051. The next prime is 21126722077. The reversal of 21126722073 is 37022762112.

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

It is not a de Polignac number, because 21126722073 - 2⁶ = 21126722009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21126722077) 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, 199590 + ... + 286512.

It is an arithmetic number, because the mean of its divisors is an integer number (3521204316).

Almost surely, 2^21126722073 is an apocalyptic number.

It is an amenable number.

21126722073 is a deficient number, since it is larger than the sum of its proper divisors (7042912455).

21126722073 is an equidigital number, since it uses as much as digits as its factorization.

21126722073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167943.

The product of its (nonzero) digits is 14112, while the sum is 33.

The spelling of 21126722073 in words is "twenty-one billion, one hundred twenty-six million, seven hundred twenty-two thousand, seventy-three".