21222726146 has 8 divisors (see below), whose sum is σ = 31838473740. Its totient is φ = 10609901568.

The previous prime is 21222726143. The next prime is 21222726149. The reversal of 21222726146 is 64162722212.

It is an interprime number because it is at equal distance from previous prime (21222726143) and next prime (21222726149).

It can be written as a sum of positive squares in 2 ways, for example, as 21123424921 + 99301225 = 145339^2 + 9965^2 .

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

It is a super-2 number, since 2×21222726146² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21222726143) 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, 712511 + ... + 741698.

Almost surely, 2^21222726146 is an apocalyptic number.

21222726146 is a deficient number, since it is larger than the sum of its proper divisors (10615747594).

21222726146 is a wasteful number, since it uses less digits than its factorization.

21222726146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461508.

The product of its digits is 32256, while the sum is 35.

The spelling of 21222726146 in words is "twenty-one billion, two hundred twenty-two million, seven hundred twenty-six thousand, one hundred forty-six".