21444330402 has 24 divisors (see below), whose sum is σ = 50686599600. Its totient is φ = 6498281880.

The previous prime is 21444330359. The next prime is 21444330431. The reversal of 21444330402 is 20403344412.

It is a happy number.

21444330402 is a `hidden beast` number, since 214 + 4 + 43 + 3 + 0 + 402 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54152152 + ... + 54152547.

It is an arithmetic number, because the mean of its divisors is an integer number (2111941650).

Almost surely, 2^21444330402 is an apocalyptic number.

21444330402 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21444330402 is an abundant number, since it is smaller than the sum of its proper divisors (29242269198).

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

21444330402 is a wasteful number, since it uses less digits than its factorization.

21444330402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108304718 (or 108304715 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21444330402 its reverse (20403344412), we get a palindrome (41847674814).

The spelling of 21444330402 in words is "twenty-one billion, four hundred forty-four million, three hundred thirty thousand, four hundred two".