21119697 has 20 divisors (see below), whose sum is σ = 33212080. Its totient is φ = 13337784.

The previous prime is 21119687. The next prime is 21119701. The reversal of 21119697 is 79691112.

It is not a de Polignac number, because 21119697 - 2¹⁸ = 20857553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21119617) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 5323 + ... + 8400.

It is an arithmetic number, because the mean of its divisors is an integer number (1660604).

Almost surely, 2^21119697 is an apocalyptic number.

21119697 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21119697 is a deficient number, since it is larger than the sum of its proper divisors (12092383).

21119697 is a wasteful number, since it uses less digits than its factorization.

21119697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13754 (or 13745 counting only the distinct ones).

The product of its digits is 6804, while the sum is 36.

The square root of 21119697 is about 4595.6171511561. The cubic root of 21119697 is about 276.4156073139.

The spelling of 21119697 in words is "twenty-one million, one hundred nineteen thousand, six hundred ninety-seven".