21290214 has 32 divisors (see below), whose sum is σ = 46713600. Its totient is φ = 6415200.

The previous prime is 21290189. The next prime is 21290219. The reversal of 21290214 is 41209212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21290219) 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 15 ways as a sum of consecutive naturals, for example, 12324 + ... + 13944.

It is an arithmetic number, because the mean of its divisors is an integer number (1459800).

Almost surely, 2^21290214 is an apocalyptic number.

21290214 is an abundant number, since it is smaller than the sum of its proper divisors (25423386).

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

21290214 is a wasteful number, since it uses less digits than its factorization.

21290214 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1836.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 21290214 is about 4614.1319877091. The cubic root of 21290214 is about 277.1575257307.

Adding to 21290214 its reverse (41209212), we get a palindrome (62499426).

The spelling of 21290214 in words is "twenty-one million, two hundred ninety thousand, two hundred fourteen".