21571722226 has 8 divisors (see below), whose sum is σ = 32376368304. Its totient is φ = 10779599460.

The previous prime is 21571722223. The next prime is 21571722269. The reversal of 21571722226 is 62222717512.

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

It is not an unprimeable number, because it can be changed into a prime (21571722223) 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, 3126520 + ... + 3133411.

It is an arithmetic number, because the mean of its divisors is an integer number (4047046038).

Almost surely, 2^21571722226 is an apocalyptic number.

21571722226 is a deficient number, since it is larger than the sum of its proper divisors (10804646078).

21571722226 is a wasteful number, since it uses less digits than its factorization.

21571722226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6261656.

The product of its digits is 47040, while the sum is 37.

The spelling of 21571722226 in words is "twenty-one billion, five hundred seventy-one million, seven hundred twenty-two thousand, two hundred twenty-six".