18960421 has 2 divisors, whose sum is σ = 18960422. Its totient is φ = 18960420.

The previous prime is 18960413. The next prime is 18960433. The reversal of 18960421 is 12406981.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16695396 + 2265025 = 4086^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 18960421 - 2³ = 18960413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18960451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9480210 + 9480211.

It is an arithmetic number, because the mean of its divisors is an integer number (9480211).

Almost surely, 2^18960421 is an apocalyptic number.

It is an amenable number.

18960421 is a deficient number, since it is larger than the sum of its proper divisors (1).

18960421 is an equidigital number, since it uses as much as digits as its factorization.

18960421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 18960421 is about 4354.3565540732. The cubic root of 18960421 is about 266.6547506828.

The spelling of 18960421 in words is "eighteen million, nine hundred sixty thousand, four hundred twenty-one".