21294030 has 64 divisors (see below), whose sum is σ = 55427328. Its totient is φ = 5214720.

The previous prime is 21294029. The next prime is 21294089. The reversal of 21294030 is 3049212.

It is a junction number, because it is equal to n+sod(n) for n = 21293988 and 21294006.

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, 21445 + ... + 22415.

It is an arithmetic number, because the mean of its divisors is an integer number (866052).

Almost surely, 2^21294030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21294030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27713664).

21294030 is an abundant number, since it is smaller than the sum of its proper divisors (34133298).

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

21294030 is a wasteful number, since it uses less digits than its factorization.

21294030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1041.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 21294030 is about 4614.5454814098. The cubic root of 21294030 is about 277.1740837282.

The spelling of 21294030 in words is "twenty-one million, two hundred ninety-four thousand, thirty".