21310244442 has 48 divisors (see below), whose sum is σ = 46609587648. Its totient is φ = 7036202880.

The previous prime is 21310244407. The next prime is 21310244477. The reversal of 21310244442 is 24444201312.

21310244442 is a `hidden beast` number, since 213 + 1 + 0 + 2 + 4 + 4 + 442 = 666.

It is an interprime number because it is at equal distance from previous prime (21310244407) and next prime (21310244477).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6513267 + ... + 6516537.

It is an arithmetic number, because the mean of its divisors is an integer number (971033076).

Almost surely, 2^21310244442 is an apocalyptic number.

21310244442 is an abundant number, since it is smaller than the sum of its proper divisors (25299343206).

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

21310244442 is a wasteful number, since it uses less digits than its factorization.

21310244442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6595 (or 6592 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

Adding to 21310244442 its reverse (24444201312), we get a palindrome (45754445754).

The spelling of 21310244442 in words is "twenty-one billion, three hundred ten million, two hundred forty-four thousand, four hundred forty-two".