21453068 has 24 divisors (see below), whose sum is σ = 46207392. Its totient is φ = 8486784.

The previous prime is 21453067. The next prime is 21453079. The reversal of 21453068 is 86035412.

It is a super-2 number, since 2×21453068² = 920468253225248, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21453068.

It is not an unprimeable number, because it can be changed into a prime (21453067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29105 + ... + 29832.

It is an arithmetic number, because the mean of its divisors is an integer number (1925308).

Almost surely, 2^21453068 is an apocalyptic number.

21453068 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21453068 is an abundant number, since it is smaller than the sum of its proper divisors (24754324).

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

21453068 is a wasteful number, since it uses less digits than its factorization.

21453068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58961 (or 58959 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 21453068 is about 4631.7456752287. The cubic root of 21453068 is about 277.8624131552.

The spelling of 21453068 in words is "twenty-one million, four hundred fifty-three thousand, sixty-eight".