21880331 has 8 divisors (see below), whose sum is σ = 23974704. Its totient is φ = 19803520.

The previous prime is 21880321. The next prime is 21880367. The reversal of 21880331 is 13308812.

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

It is not a de Polignac number, because 21880331 - 2¹⁰ = 21879307 is a prime.

It is a super-2 number, since 2×21880331² = 957497769339122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21880331.

It is not an unprimeable number, because it can be changed into a prime (21880321) 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, 1706 + ... + 6831.

It is an arithmetic number, because the mean of its divisors is an integer number (2996838).

Almost surely, 2^21880331 is an apocalyptic number.

21880331 is a deficient number, since it is larger than the sum of its proper divisors (2094373).

21880331 is a wasteful number, since it uses less digits than its factorization.

21880331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8781.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 21880331 is about 4677.6416066219. The cubic root of 21880331 is about 279.6949526493.

The spelling of 21880331 in words is "twenty-one million, eight hundred eighty thousand, three hundred thirty-one".