21868968 has 32 divisors (see below), whose sum is σ = 59643360. Its totient is φ = 6626880.

The previous prime is 21868937. The next prime is 21868969. The reversal of 21868968 is 86986812.

It is a super-2 number, since 2×21868968² = 956503522770048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21868969) 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, 41155 + ... + 41682.

It is an arithmetic number, because the mean of its divisors is an integer number (1863855).

Almost surely, 2^21868968 is an apocalyptic number.

It is an amenable number.

21868968 is an abundant number, since it is smaller than the sum of its proper divisors (37774392).

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

21868968 is a wasteful number, since it uses less digits than its factorization.

21868968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82857 (or 82853 counting only the distinct ones).

The product of its digits is 331776, while the sum is 48.

The square root of 21868968 is about 4676.4268410828. The cubic root of 21868968 is about 279.6465267507.

The spelling of 21868968 in words is "twenty-one million, eight hundred sixty-eight thousand, nine hundred sixty-eight".