21834930 has 32 divisors (see below), whose sum is σ = 56435904. Its totient is φ = 5374656.

The previous prime is 21834899. The next prime is 21834947. The reversal of 21834930 is 3943812.

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27604 + ... + 28383.

It is an arithmetic number, because the mean of its divisors is an integer number (1763622).

Almost surely, 2^21834930 is an apocalyptic number.

21834930 is an abundant number, since it is smaller than the sum of its proper divisors (34600974).

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

21834930 is a wasteful number, since it uses less digits than its factorization.

21834930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56010.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21834930 is about 4672.7861068104. The cubic root of 21834930 is about 279.5013659430.

The spelling of 21834930 in words is "twenty-one million, eight hundred thirty-four thousand, nine hundred thirty".