21298497 has 8 divisors (see below), whose sum is σ = 30979680. Its totient is φ = 12908160.

The previous prime is 21298493. The next prime is 21298517. The reversal of 21298497 is 79489212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21298497 - 2² = 21298493 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21298493) 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, 322672 + ... + 322737.

It is an arithmetic number, because the mean of its divisors is an integer number (3872460).

Almost surely, 2^21298497 is an apocalyptic number.

It is an amenable number.

21298497 is a deficient number, since it is larger than the sum of its proper divisors (9681183).

21298497 is a wasteful number, since it uses less digits than its factorization.

21298497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645423.

The product of its digits is 72576, while the sum is 42.

The square root of 21298497 is about 4615.0294690283. The cubic root of 21298497 is about 277.1934639655.

The spelling of 21298497 in words is "twenty-one million, two hundred ninety-eight thousand, four hundred ninety-seven".