21290094 has 64 divisors (see below), whose sum is σ = 54574080. Its totient is φ = 6026400.

The previous prime is 21290083. The next prime is 21290119. The reversal of 21290094 is 49009212.

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

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 56892 + ... + 57264.

It is an arithmetic number, because the mean of its divisors is an integer number (852720).

Almost surely, 2^21290094 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21290094, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27287040).

21290094 is an abundant number, since it is smaller than the sum of its proper divisors (33283986).

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

21290094 is a wasteful number, since it uses less digits than its factorization.

21290094 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 21290094 is about 4614.1189841615. The cubic root of 21290094 is about 277.1570050068.

The spelling of 21290094 in words is "twenty-one million, two hundred ninety thousand, ninety-four".