21619463 has 2 divisors, whose sum is σ = 21619464. Its totient is φ = 21619462.

The previous prime is 21619459. The next prime is 21619487. The reversal of 21619463 is 36491612.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21619463 - 2² = 21619459 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21619363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10809731 + 10809732.

It is an arithmetic number, because the mean of its divisors is an integer number (10809732).

Almost surely, 2^21619463 is an apocalyptic number.

21619463 is a deficient number, since it is larger than the sum of its proper divisors (1).

21619463 is an equidigital number, since it uses as much as digits as its factorization.

21619463 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 32.

The square root of 21619463 is about 4649.6734293926. The cubic root of 21619463 is about 278.5789523531.

The spelling of 21619463 in words is "twenty-one million, six hundred nineteen thousand, four hundred sixty-three".