21121194 has 16 divisors (see below), whose sum is σ = 42353568. Its totient is φ = 7021872.

The previous prime is 21121187. The next prime is 21121201. The reversal of 21121194 is 49112112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21121187) and next prime (21121201).

It is a super-2 number, since 2×21121194² = 892209671971272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121194.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2052 + ... + 6815.

It is an arithmetic number, because the mean of its divisors is an integer number (2647098).

Almost surely, 2^21121194 is an apocalyptic number.

21121194 is an abundant number, since it is smaller than the sum of its proper divisors (21232374).

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

21121194 is a wasteful number, since it uses less digits than its factorization.

21121194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9269.

The product of its digits is 144, while the sum is 21.

The square root of 21121194 is about 4595.7800208452. The cubic root of 21121194 is about 276.4221380956.

The spelling of 21121194 in words is "twenty-one million, one hundred twenty-one thousand, one hundred ninety-four".