21419430 has 16 divisors (see below), whose sum is σ = 51406704. Its totient is φ = 5711840.

The previous prime is 21419401. The next prime is 21419449. The reversal of 21419430 is 3491412.

It is a self number, because there is not a number n which added to its sum of digits gives 21419430.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 356961 + ... + 357020.

It is an arithmetic number, because the mean of its divisors is an integer number (3212919).

Almost surely, 2^21419430 is an apocalyptic number.

21419430 is an abundant number, since it is smaller than the sum of its proper divisors (29987274).

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

21419430 is a wasteful number, since it uses less digits than its factorization.

21419430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713991.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 21419430 is about 4628.1130063990. The cubic root of 21419430 is about 277.7171095359.

The spelling of 21419430 in words is "twenty-one million, four hundred nineteen thousand, four hundred thirty".