21954472 has 8 divisors (see below), whose sum is σ = 41164650. Its totient is φ = 10977232.

The previous prime is 21954461. The next prime is 21954487. The reversal of 21954472 is 27445912.

It can be written as a sum of positive squares in only one way, i.e., 15163236 + 6791236 = 3894^2 + 2606^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1372147 + ... + 1372162.

Almost surely, 2^21954472 is an apocalyptic number.

It is an amenable number.

21954472 is a deficient number, since it is larger than the sum of its proper divisors (19210178).

21954472 is a wasteful number, since it uses less digits than its factorization.

21954472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2744315 (or 2744311 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 21954472 is about 4685.5599451933. The cubic root of 21954472 is about 280.0105098096.

The spelling of 21954472 in words is "twenty-one million, nine hundred fifty-four thousand, four hundred seventy-two".