21345353244 has 36 divisors (see below), whose sum is σ = 55104320544. Its totient is φ = 6963731712.

The previous prime is 21345353219. The next prime is 21345353269. The reversal of 21345353244 is 44235354312.

21345353244 is a `hidden beast` number, since 2 + 1 + 34 + 53 + 532 + 44 = 666.

It is an interprime number because it is at equal distance from previous prime (21345353219) and next prime (21345353269).

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×21345353244² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 21345353199 and 21345353208.

It is a congruent number.

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, 6306037 + ... + 6309420.

Almost surely, 2^21345353244 is an apocalyptic number.

It is an amenable number.

21345353244 is an abundant number, since it is smaller than the sum of its proper divisors (33758967300).

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

21345353244 is a wasteful number, since it uses less digits than its factorization.

21345353244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12615514 (or 12615509 counting only the distinct ones).

The product of its digits is 172800, while the sum is 36.

The spelling of 21345353244 in words is "twenty-one billion, three hundred forty-five million, three hundred fifty-three thousand, two hundred forty-four".