21429494 has 8 divisors (see below), whose sum is σ = 33181248. Its totient is φ = 10369080.

The previous prime is 21429451. The next prime is 21429533. The reversal of 21429494 is 49492412.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172757 + ... + 172880.

It is an arithmetic number, because the mean of its divisors is an integer number (4147656).

Almost surely, 2^21429494 is an apocalyptic number.

21429494 is a deficient number, since it is larger than the sum of its proper divisors (11751754).

21429494 is a wasteful number, since it uses less digits than its factorization.

21429494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345670.

The product of its digits is 20736, while the sum is 35.

The square root of 21429494 is about 4629.2001468936. The cubic root of 21429494 is about 277.7605982027.

The spelling of 21429494 in words is "twenty-one million, four hundred twenty-nine thousand, four hundred ninety-four".