21514390 has 16 divisors (see below), whose sum is σ = 39773232. Its totient is φ = 8373024.

The previous prime is 21514387. The next prime is 21514397. The reversal of 21514390 is 9341512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28704 + ... + 29443.

It is an arithmetic number, because the mean of its divisors is an integer number (2485827).

Almost surely, 2^21514390 is an apocalyptic number.

21514390 is a deficient number, since it is larger than the sum of its proper divisors (18258842).

21514390 is a wasteful number, since it uses less digits than its factorization.

21514390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58191.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 21514390 is about 4638.3607017997. The cubic root of 21514390 is about 278.1269109830.

It can be divided in two parts, 21514 and 390, that added together give a square (21904 = 148²).

The spelling of 21514390 in words is "twenty-one million, five hundred fourteen thousand, three hundred ninety".