21799368 has 40 divisors (see below), whose sum is σ = 61060230. Its totient is φ = 7266240.

The previous prime is 21799367. The next prime is 21799381. The reversal of 21799368 is 86399712.

It can be written as a sum of positive squares in only one way, i.e., 15539364 + 6260004 = 3942^2 + 2502^2 .

It is not an unprimeable number, because it can be changed into a prime (21799363) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 16173 + ... + 17468.

Almost surely, 2^21799368 is an apocalyptic number.

It is an amenable number.

21799368 is an abundant number, since it is smaller than the sum of its proper divisors (39260862).

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

21799368 is a wasteful number, since it uses less digits than its factorization.

21799368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33659 (or 33646 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 21799368 is about 4668.9793317169. The cubic root of 21799368 is about 279.3495445479.

The spelling of 21799368 in words is "twenty-one million, seven hundred ninety-nine thousand, three hundred sixty-eight".