21001094 has 4 divisors (see below), whose sum is σ = 31501644. Its totient is φ = 10500546.

The previous prime is 21001087. The next prime is 21001117. The reversal of 21001094 is 49010012.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250272 + ... + 5250275.

It is an arithmetic number, because the mean of its divisors is an integer number (7875411).

Almost surely, 2^21001094 is an apocalyptic number.

21001094 is a deficient number, since it is larger than the sum of its proper divisors (10500550).

21001094 is a wasteful number, since it uses less digits than its factorization.

21001094 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500549.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 21001094 is about 4582.6950585873. The cubic root of 21001094 is about 275.8972084486.

The spelling of 21001094 in words is "twenty-one million, one thousand, ninety-four".