21968924453 has 12 divisors (see below), whose sum is σ = 25578508320. Its totient is φ = 18813691512.

The previous prime is 21968924449. The next prime is 21968924489. The reversal of 21968924453 is 35442986912.

It is not a de Polignac number, because 21968924453 - 2² = 21968924449 is a prime.

It is a super-3 number, since 3×21968924453³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21968924395 and 21968924404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21968924423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144593 + ... + 254646.

It is an arithmetic number, because the mean of its divisors is an integer number (2131542360).

Almost surely, 2^21968924453 is an apocalyptic number.

It is an amenable number.

21968924453 is a deficient number, since it is larger than the sum of its proper divisors (3609583867).

21968924453 is a wasteful number, since it uses less digits than its factorization.

21968924453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400376 (or 400369 counting only the distinct ones).

The product of its digits is 3732480, while the sum is 53.

The spelling of 21968924453 in words is "twenty-one billion, nine hundred sixty-eight million, nine hundred twenty-four thousand, four hundred fifty-three".