21693430 has 48 divisors (see below), whose sum is σ = 44124912. Its totient is φ = 7612800.

The previous prime is 21693407. The next prime is 21693437. The reversal of 21693430 is 3439612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21693437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 355600 + ... + 355660.

It is an arithmetic number, because the mean of its divisors is an integer number (919269).

Almost surely, 2^21693430 is an apocalyptic number.

21693430 is an abundant number, since it is smaller than the sum of its proper divisors (22431482).

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

21693430 is a wasteful number, since it uses less digits than its factorization.

21693430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 21693430 is about 4657.6206371923. The cubic root of 21693430 is about 278.8962928664.

The spelling of 21693430 in words is "twenty-one million, six hundred ninety-three thousand, four hundred thirty".