21421751626 has 32 divisors (see below), whose sum is σ = 36197498880. Its totient is φ = 9419684400.

The previous prime is 21421751591. The next prime is 21421751633. The reversal of 21421751626 is 62615712412.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3520855 + ... + 3526933.

It is an arithmetic number, because the mean of its divisors is an integer number (1131171840).

Almost surely, 2^21421751626 is an apocalyptic number.

21421751626 is a deficient number, since it is larger than the sum of its proper divisors (14775747254).

21421751626 is a wasteful number, since it uses less digits than its factorization.

21421751626 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11290.

The product of its digits is 40320, while the sum is 37.

The spelling of 21421751626 in words is "twenty-one billion, four hundred twenty-one million, seven hundred fifty-one thousand, six hundred twenty-six".