21214619 has 2 divisors, whose sum is σ = 21214620. Its totient is φ = 21214618.

The previous prime is 21214577. The next prime is 21214643. The reversal of 21214619 is 91641212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21214619 - 2¹⁶ = 21149083 is a prime.

It is a super-2 number, since 2×21214619² = 900120118630322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21214649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10607309 + 10607310.

It is an arithmetic number, because the mean of its divisors is an integer number (10607310).

Almost surely, 2^21214619 is an apocalyptic number.

21214619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21214619 is an equidigital number, since it uses as much as digits as its factorization.

21214619 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 26.

The square root of 21214619 is about 4605.9330216580. The cubic root of 21214619 is about 276.8291030118.

The spelling of 21214619 in words is "twenty-one million, two hundred fourteen thousand, six hundred nineteen".