21119021 has 16 divisors (see below), whose sum is σ = 26707968. Its totient is φ = 16220400.

The previous prime is 21118997. The next prime is 21119023. The reversal of 21119021 is 12091112.

It is not a de Polignac number, because 21119021 - 2¹⁰ = 21117997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3536 + ... + 7398.

It is an arithmetic number, because the mean of its divisors is an integer number (1669248).

Almost surely, 2^21119021 is an apocalyptic number.

It is an amenable number.

21119021 is a deficient number, since it is larger than the sum of its proper divisors (5588947).

21119021 is a wasteful number, since it uses less digits than its factorization.

21119021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3952.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 21119021 is about 4595.5436022303. The cubic root of 21119021 is about 276.4126581090.

The spelling of 21119021 in words is "twenty-one million, one hundred nineteen thousand, twenty-one".