21623054 has 8 divisors (see below), whose sum is σ = 32479488. Its totient is φ = 10796560.

The previous prime is 21622999. The next prime is 21623057. The reversal of 21623054 is 45032612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21623057) 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, 5582 + ... + 8625.

It is an arithmetic number, because the mean of its divisors is an integer number (4059936).

Almost surely, 2^21623054 is an apocalyptic number.

21623054 is a deficient number, since it is larger than the sum of its proper divisors (10856434).

21623054 is a wasteful number, since it uses less digits than its factorization.

21623054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14970.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 21623054 is about 4650.0595695109. The cubic root of 21623054 is about 278.5943755181.

Adding to 21623054 its reverse (45032612), we get a palindrome (66655666).

The spelling of 21623054 in words is "twenty-one million, six hundred twenty-three thousand, fifty-four".