21497460 has 24 divisors (see below), whose sum is σ = 60193056. Its totient is φ = 5732640.

The previous prime is 21497429. The next prime is 21497467. The reversal of 21497460 is 6479412.

It is a happy number.

It is a super-3 number, since 3×21497460³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21497467) 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, 179086 + ... + 179205.

It is an arithmetic number, because the mean of its divisors is an integer number (2508044).

Almost surely, 2^21497460 is an apocalyptic number.

21497460 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21497460 is an abundant number, since it is smaller than the sum of its proper divisors (38695596).

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

21497460 is a wasteful number, since it uses less digits than its factorization.

21497460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358303 (or 358301 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 21497460 is about 4636.5353444140. The cubic root of 21497460 is about 278.0539377426.

The spelling of 21497460 in words is "twenty-one million, four hundred ninety-seven thousand, four hundred sixty".