21454760 has 32 divisors (see below), whose sum is σ = 49096800. Its totient is φ = 8435520.

The previous prime is 21454747. The next prime is 21454777. The reversal of 21454760 is 6745412.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2186 + ... + 6905.

It is an arithmetic number, because the mean of its divisors is an integer number (1534275).

Almost surely, 2^21454760 is an apocalyptic number.

21454760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21454760 is an abundant number, since it is smaller than the sum of its proper divisors (27642040).

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

21454760 is a wasteful number, since it uses less digits than its factorization.

21454760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9161 (or 9157 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 21454760 is about 4631.9283241432. The cubic root of 21454760 is about 277.8697179510.

The spelling of 21454760 in words is "twenty-one million, four hundred fifty-four thousand, seven hundred sixty".