21245354452 has 12 divisors (see below), whose sum is σ = 42490708960. Its totient is φ = 9105151896.

The previous prime is 21245354443. The next prime is 21245354489. The reversal of 21245354452 is 25445354212.

21245354452 is an admirable number.

It is a super-2 number, since 2×21245354452² (a number of 21 digits) contains 22 as substring.

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, 379381302 + ... + 379381357.

Almost surely, 2^21245354452 is an apocalyptic number.

It is an amenable number.

21245354452 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21245354452 is a wasteful number, since it uses less digits than its factorization.

21245354452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758762670 (or 758762668 counting only the distinct ones).

The product of its digits is 192000, while the sum is 37.

The spelling of 21245354452 in words is "twenty-one billion, two hundred forty-five million, three hundred fifty-four thousand, four hundred fifty-two".