21419830 has 32 divisors (see below), whose sum is σ = 41127264. Its totient is φ = 8004096.

The previous prime is 21419807. The next prime is 21419837. The reversal of 21419830 is 3891412.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21419837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27324 + ... + 28096.

It is an arithmetic number, because the mean of its divisors is an integer number (1285227).

Almost surely, 2^21419830 is an apocalyptic number.

21419830 is a deficient number, since it is larger than the sum of its proper divisors (19707434).

21419830 is a wasteful number, since it uses less digits than its factorization.

21419830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 21419830 is about 4628.1562203538. The cubic root of 21419830 is about 277.7188382802.

The spelling of 21419830 in words is "twenty-one million, four hundred nineteen thousand, eight hundred thirty".