21290694 has 16 divisors (see below), whose sum is σ = 42692400. Its totient is φ = 7078400.

The previous prime is 21290693. The next prime is 21290701. The reversal of 21290694 is 49609212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21290693) 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, 2019 + ... + 6830.

It is an arithmetic number, because the mean of its divisors is an integer number (2668275).

Almost surely, 2^21290694 is an apocalyptic number.

21290694 is an abundant number, since it is smaller than the sum of its proper divisors (21401706).

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

21290694 is a wasteful number, since it uses less digits than its factorization.

21290694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9255.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 21290694 is about 4614.1840015327. The cubic root of 21290694 is about 277.1596086064.

The spelling of 21290694 in words is "twenty-one million, two hundred ninety thousand, six hundred ninety-four".