21450611105424 has 60 divisors (see below), whose sum is σ = 61016048417532. Its totient is φ = 7032987244800.

The previous prime is 21450611105401. The next prime is 21450611105447. The reversal of 21450611105424 is 42450111605412.

21450611105424 is a `hidden beast` number, since 2 + 1 + 4 + 5 + 0 + 611 + 10 + 5 + 4 + 24 = 666.

It is an interprime number because it is at equal distance from previous prime (21450611105401) and next prime (21450611105447).

It can be written as a sum of positive squares in 2 ways, for example, as 5905191603600 + 15545419501824 = 2430060^2 + 3942768^2 .

It is a super-2 number, since 2×21450611105424² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1220995947 + ... + 1221013514.

Almost surely, 2^{21450611105424} is an apocalyptic number.

21450611105424 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21450611105424 is an abundant number, since it is smaller than the sum of its proper divisors (39565437312108).

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

21450611105424 is a wasteful number, since it uses less digits than its factorization.

21450611105424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2442009536 (or 2442009527 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 21450611105424 in words is "twenty-one trillion, four hundred fifty billion, six hundred eleven million, one hundred five thousand, four hundred twenty-four".