21899298 has 32 divisors (see below), whose sum is σ = 47462976. Its totient is φ = 6709248.

The previous prime is 21899279. The next prime is 21899303. The reversal of 21899298 is 89299812.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1890 + ... + 6882.

It is an arithmetic number, because the mean of its divisors is an integer number (1483218).

Almost surely, 2^21899298 is an apocalyptic number.

21899298 is an abundant number, since it is smaller than the sum of its proper divisors (25563678).

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

21899298 is a wasteful number, since it uses less digits than its factorization.

21899298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5058.

The product of its digits is 186624, while the sum is 48.

The square root of 21899298 is about 4679.6685780085. The cubic root of 21899298 is about 279.7757473142.

The spelling of 21899298 in words is "twenty-one million, eight hundred ninety-nine thousand, two hundred ninety-eight".