21370619 has 2 divisors, whose sum is σ = 21370620. Its totient is φ = 21370618.

The previous prime is 21370603. The next prime is 21370621. The reversal of 21370619 is 91607312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21370619 - 2⁴ = 21370603 is a prime.

It is a super-2 number, since 2×21370619² = 913406712886322, which contains 22 as substring.

Together with 21370621, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 21370591 and 21370600.

It is not a weakly prime, because it can be changed into another prime (21370639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10685309 + 10685310.

It is an arithmetic number, because the mean of its divisors is an integer number (10685310).

Almost surely, 2^21370619 is an apocalyptic number.

21370619 is a deficient number, since it is larger than the sum of its proper divisors (1).

21370619 is an equidigital number, since it uses as much as digits as its factorization.

21370619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21370619 is about 4622.8366832498. The cubic root of 21370619 is about 277.5059934317.

The spelling of 21370619 in words is "twenty-one million, three hundred seventy thousand, six hundred nineteen".