880660021 has 2 divisors, whose sum is σ = 880660022. Its totient is φ = 880660020.

The previous prime is 880660007. The next prime is 880660043. The reversal of 880660021 is 120066088.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 879419025 + 1240996 = 29655^2 + 1114^2 .

It is a cyclic number.

It is not a de Polignac number, because 880660021 - 2¹⁷ = 880528949 is a prime.

It is a super-3 number, since 3×880660021³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (880660091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 440330010 + 440330011.

It is an arithmetic number, because the mean of its divisors is an integer number (440330011).

Almost surely, 2^880660021 is an apocalyptic number.

It is an amenable number.

880660021 is a deficient number, since it is larger than the sum of its proper divisors (1).

880660021 is an equidigital number, since it uses as much as digits as its factorization.

880660021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 880660021 is about 29675.9165149115. The cubic root of 880660021 is about 958.5234901565.

The spelling of 880660021 in words is "eight hundred eighty million, six hundred sixty thousand, twenty-one".