21906211422 has 16 divisors (see below), whose sum is σ = 43903895040. Its totient is φ = 7286825112.

The previous prime is 21906211409. The next prime is 21906211433. The reversal of 21906211422 is 22411260912.

It is a self number, because there is not a number n which added to its sum of digits gives 21906211422.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3808228 + ... + 3813975.

It is an arithmetic number, because the mean of its divisors is an integer number (2743993440).

Almost surely, 2^21906211422 is an apocalyptic number.

21906211422 is an abundant number, since it is smaller than the sum of its proper divisors (21997683618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21906211422 is a wasteful number, since it uses less digits than its factorization.

21906211422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7622687.

The product of its (nonzero) digits is 3456, while the sum is 30.

The spelling of 21906211422 in words is "twenty-one billion, nine hundred six million, two hundred eleven thousand, four hundred twenty-two".