21147024 has 40 divisors (see below), whose sum is σ = 55075840. Its totient is φ = 6991488.

The previous prime is 21146987. The next prime is 21147029. The reversal of 21147024 is 42074112.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21147029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4362 + ... + 7830.

It is an arithmetic number, because the mean of its divisors is an integer number (1376896).

Almost surely, 2^21147024 is an apocalyptic number.

21147024 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21147024 is an abundant number, since it is smaller than the sum of its proper divisors (33928816).

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

21147024 is a wasteful number, since it uses less digits than its factorization.

21147024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607 (or 3601 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 21.

The square root of 21147024 is about 4598.5893489199. The cubic root of 21147024 is about 276.5347749602.

The spelling of 21147024 in words is "twenty-one million, one hundred forty-seven thousand, twenty-four".