21455060 has 24 divisors (see below), whose sum is σ = 49152096. Its totient is φ = 7801760.

The previous prime is 21455059. The next prime is 21455087. The reversal of 21455060 is 6055412.

It is a congruent number.

It is an unprimeable number.

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, 48542 + ... + 48981.

It is an arithmetic number, because the mean of its divisors is an integer number (2048004).

Almost surely, 2^21455060 is an apocalyptic number.

21455060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21455060 is an abundant number, since it is smaller than the sum of its proper divisors (27697036).

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

21455060 is a wasteful number, since it uses less digits than its factorization.

21455060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97543 (or 97541 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 21455060 is about 4631.9607079508. The cubic root of 21455060 is about 277.8710130875.

The spelling of 21455060 in words is "twenty-one million, four hundred fifty-five thousand, sixty".