21630336453 has 24 divisors (see below), whose sum is σ = 35566090560. Its totient is φ = 12539324160.

The previous prime is 21630336449. The next prime is 21630336457. The reversal of 21630336453 is 35463303612.

21630336453 is a `hidden beast` number, since 2 + 1 + 6 + 3 + 0 + 3 + 3 + 645 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (21630336449) and next prime (21630336457).

It is not a de Polignac number, because 21630336453 - 2² = 21630336449 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21630336457) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4747468 + ... + 4752021.

It is an arithmetic number, because the mean of its divisors is an integer number (1481920440).

Almost surely, 2^21630336453 is an apocalyptic number.

21630336453 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21630336453 is a deficient number, since it is larger than the sum of its proper divisors (13935754107).

21630336453 is a wasteful number, since it uses less digits than its factorization.

21630336453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9499529 (or 9499526 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 36.

The spelling of 21630336453 in words is "twenty-one billion, six hundred thirty million, three hundred thirty-six thousand, four hundred fifty-three".