21494941 has 6 divisors (see below), whose sum is σ = 23275770. Its totient is φ = 19841328.

The previous prime is 21494929. The next prime is 21494959. The reversal of 21494941 is 14949412.

It can be written as a sum of positive squares in 3 ways, for example, as 2090916 + 19404025 = 1446^2 + 4405^2 .

It is not a de Polignac number, because 21494941 - 2⁷ = 21494813 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21494897 and 21494906.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21494911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63426 + ... + 63763.

It is an arithmetic number, because the mean of its divisors is an integer number (3879295).

Almost surely, 2^21494941 is an apocalyptic number.

It is an amenable number.

21494941 is a deficient number, since it is larger than the sum of its proper divisors (1780829).

21494941 is a wasteful number, since it uses less digits than its factorization.

21494941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127215 (or 127202 counting only the distinct ones).

The product of its digits is 10368, while the sum is 34.

The square root of 21494941 is about 4636.2636896536. The cubic root of 21494941 is about 278.0430768436.

The spelling of 21494941 in words is "twenty-one million, four hundred ninety-four thousand, nine hundred forty-one".