21954270 has 64 divisors (see below), whose sum is σ = 58169664. Its totient is φ = 5268480.

The previous prime is 21954263. The next prime is 21954281. The reversal of 21954270 is 7245912.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15304 + ... + 16676.

It is an arithmetic number, because the mean of its divisors is an integer number (908901).

Almost surely, 2^21954270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21954270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29084832).

21954270 is an abundant number, since it is smaller than the sum of its proper divisors (36215394).

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

21954270 is a wasteful number, since it uses less digits than its factorization.

21954270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 21954270 is about 4685.5383895557. The cubic root of 21954270 is about 280.0096510279.

The spelling of 21954270 in words is "twenty-one million, nine hundred fifty-four thousand, two hundred seventy".