21415298 has 8 divisors (see below), whose sum is σ = 32197440. Its totient is φ = 10682820.

The previous prime is 21415249. The next prime is 21415307. The reversal of 21415298 is 89251412.

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

It is a super-2 number, since 2×21415298² = 917229976857608, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11318 + ... + 13073.

It is an arithmetic number, because the mean of its divisors is an integer number (4024680).

Almost surely, 2^21415298 is an apocalyptic number.

21415298 is a deficient number, since it is larger than the sum of its proper divisors (10782142).

21415298 is a wasteful number, since it uses less digits than its factorization.

21415298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24832.

The product of its digits is 5760, while the sum is 32.

The square root of 21415298 is about 4627.6665826310. Note that the first 3 decimals coincide. The cubic root of 21415298 is about 277.6992503477.

The spelling of 21415298 in words is "twenty-one million, four hundred fifteen thousand, two hundred ninety-eight".