21472554 has 8 divisors (see below), whose sum is σ = 42945120. Its totient is φ = 7157516.

The previous prime is 21472541. The next prime is 21472559. The reversal of 21472554 is 45527412.

It is a sphenic number, since it is the product of 3 distinct primes.

21472554 is an admirable number.

It is a super-2 number, since 2×21472554² = 922141150565832, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21472559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789374 + ... + 1789385.

It is an arithmetic number, because the mean of its divisors is an integer number (5368140).

Almost surely, 2^21472554 is an apocalyptic number.

21472554 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21472554 is a wasteful number, since it uses less digits than its factorization.

21472554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578764.

The product of its digits is 11200, while the sum is 30.

The square root of 21472554 is about 4633.8487243327. The cubic root of 21472554 is about 277.9465159432.

Adding to 21472554 its reverse (45527412), we get a palindrome (66999966).

The spelling of 21472554 in words is "twenty-one million, four hundred seventy-two thousand, five hundred fifty-four".