21293019 has 24 divisors (see below), whose sum is σ = 34465392. Its totient is φ = 12553920.

The previous prime is 21293017. The next prime is 21293023. The reversal of 21293019 is 91039212.

It is not a de Polignac number, because 21293019 - 2¹ = 21293017 is a prime.

It is a super-2 number, since 2×21293019² = 906785316268722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21292983 and 21293001.

It is not an unprimeable number, because it can be changed into a prime (21293011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 757 + ... + 6569.

It is an arithmetic number, because the mean of its divisors is an integer number (1436058).

Almost surely, 2^21293019 is an apocalyptic number.

21293019 is a deficient number, since it is larger than the sum of its proper divisors (13172373).

21293019 is a wasteful number, since it uses less digits than its factorization.

21293019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5867 (or 5864 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 27.

The square root of 21293019 is about 4614.4359351929. The cubic root of 21293019 is about 277.1696970929.

The spelling of 21293019 in words is "twenty-one million, two hundred ninety-three thousand, nineteen".