21497035 has 12 divisors (see below), whose sum is σ = 30008448. Its totient is φ = 14740656.

The previous prime is 21497023. The next prime is 21497053. The reversal of 21497035 is 53079412.

It is not a de Polignac number, because 21497035 - 2⁹ = 21496523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21496988 and 21497006.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43627 + ... + 44116.

It is an arithmetic number, because the mean of its divisors is an integer number (2500704).

Almost surely, 2^21497035 is an apocalyptic number.

21497035 is a deficient number, since it is larger than the sum of its proper divisors (8511413).

21497035 is an equidigital number, since it uses as much as digits as its factorization.

21497035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87762 (or 87755 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 21497035 is about 4636.4895125515. The cubic root of 21497035 is about 278.0521053757.

The spelling of 21497035 in words is "twenty-one million, four hundred ninety-seven thousand, thirty-five".