21112640454 has 8 divisors (see below), whose sum is σ = 42225280920. Its totient is φ = 7037546816.

The previous prime is 21112640449. The next prime is 21112640473. The reversal of 21112640454 is 45404621112.

It is a sphenic number, since it is the product of 3 distinct primes.

21112640454 is an admirable number.

It is a super-2 number, since 2×21112640454² (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, 1759386699 + ... + 1759386710.

It is an arithmetic number, because the mean of its divisors is an integer number (5278160115).

Almost surely, 2^21112640454 is an apocalyptic number.

21112640454 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.

21112640454 is a wasteful number, since it uses less digits than its factorization.

21112640454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518773414.

The product of its (nonzero) digits is 7680, while the sum is 30.

The spelling of 21112640454 in words is "twenty-one billion, one hundred twelve million, six hundred forty thousand, four hundred fifty-four".