21123096 has 32 divisors (see below), whose sum is σ = 52987200. Its totient is φ = 7017120.

The previous prime is 21123073. The next prime is 21123103. The reversal of 21123096 is 69032112.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6615 + ... + 9273.

It is an arithmetic number, because the mean of its divisors is an integer number (1655850).

Almost surely, 2^21123096 is an apocalyptic number.

It is an amenable number.

21123096 is an abundant number, since it is smaller than the sum of its proper divisors (31864104).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21123096 is a wasteful number, since it uses less digits than its factorization.

21123096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2999 (or 2995 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21123096 is about 4595.9869451512. The cubic root of 21123096 is about 276.4304352768.

The spelling of 21123096 in words is "twenty-one million, one hundred twenty-three thousand, ninety-six".