21960619 has 2 divisors, whose sum is σ = 21960620. Its totient is φ = 21960618.

The previous prime is 21960613. The next prime is 21960641. The reversal of 21960619 is 91606912.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21960619 - 2³ = 21960611 is a prime.

It is a super-2 number, since 2×21960619² = 964537573726322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21960611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10980309 + 10980310.

It is an arithmetic number, because the mean of its divisors is an integer number (10980310).

Almost surely, 2^21960619 is an apocalyptic number.

21960619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21960619 is an equidigital number, since it uses as much as digits as its factorization.

21960619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 21960619 is about 4686.2158507691. The cubic root of 21960619 is about 280.0366406132.

The spelling of 21960619 in words is "twenty-one million, nine hundred sixty thousand, six hundred nineteen".