21574019 has 2 divisors, whose sum is σ = 21574020. Its totient is φ = 21574018.

The previous prime is 21574013. The next prime is 21574027. The reversal of 21574019 is 91047512.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21574019 - 2¹⁶ = 21508483 is a prime.

It is a super-2 number, since 2×21574019² = 930876591624722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21573982 and 21574000.

It is not a weakly prime, because it can be changed into another prime (21574013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10787009 + 10787010.

It is an arithmetic number, because the mean of its divisors is an integer number (10787010).

Almost surely, 2^21574019 is an apocalyptic number.

21574019 is a deficient number, since it is larger than the sum of its proper divisors (1).

21574019 is an equidigital number, since it uses as much as digits as its factorization.

21574019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 21574019 is about 4644.7840638721. The cubic root of 21574019 is about 278.3836249218.

The spelling of 21574019 in words is "twenty-one million, five hundred seventy-four thousand, nineteen".