21438954 has 24 divisors (see below), whose sum is σ = 48896640. Its totient is φ = 6770088.

The previous prime is 21438953. The next prime is 21438961. The reversal of 21438954 is 45983412.

It is a super-2 number, since 2×21438954² = 919257497228232, which contains 22 as substring.

It is a Curzon number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (21438953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31002 + ... + 31685.

It is an arithmetic number, because the mean of its divisors is an integer number (2037360).

Almost surely, 2^21438954 is an apocalyptic number.

21438954 is an abundant number, since it is smaller than the sum of its proper divisors (27457686).

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

21438954 is a wasteful number, since it uses less digits than its factorization.

21438954 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62714 (or 62711 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 21438954 is about 4630.2218089418. The cubic root of 21438954 is about 277.8014644453.

The spelling of 21438954 in words is "twenty-one million, four hundred thirty-eight thousand, nine hundred fifty-four".