21923514 has 16 divisors (see below), whose sum is σ = 48719040. Its totient is φ = 7307820.

The previous prime is 21923509. The next prime is 21923519. The reversal of 21923514 is 41532912.

It is an interprime number because it is at equal distance from previous prime (21923509) and next prime (21923519).

It is a super-2 number, since 2×21923514² = 961280932216392, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21923519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202942 + ... + 203049.

It is an arithmetic number, because the mean of its divisors is an integer number (3044940).

Almost surely, 2^21923514 is an apocalyptic number.

21923514 is an abundant number, since it is smaller than the sum of its proper divisors (26795526).

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

21923514 is a wasteful number, since it uses less digits than its factorization.

21923514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406002 (or 405996 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 21923514 is about 4682.2552258500. The cubic root of 21923514 is about 279.8788336288.

The spelling of 21923514 in words is "twenty-one million, nine hundred twenty-three thousand, five hundred fourteen".