21422019988 has 12 divisors (see below), whose sum is σ = 37502662932. Its totient is φ = 10706973440.

The previous prime is 21422019967. The next prime is 21422020049. The reversal of 21422019988 is 88991022412.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16121888784 + 5300131204 = 126972^2 + 72802^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 997183 + ... + 1018438.

It is an arithmetic number, because the mean of its divisors is an integer number (3125221911).

Almost surely, 2^21422019988 is an apocalyptic number.

It is an amenable number.

21422019988 is a deficient number, since it is larger than the sum of its proper divisors (16080642944).

21422019988 is a wasteful number, since it uses less digits than its factorization.

21422019988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018282 (or 2018280 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 46.

The spelling of 21422019988 in words is "twenty-one billion, four hundred twenty-two million, nineteen thousand, nine hundred eighty-eight".