21429246 has 16 divisors (see below), whose sum is σ = 44241408. Its totient is φ = 6912600.

The previous prime is 21429209. The next prime is 21429257. The reversal of 21429246 is 64292412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57420 + ... + 57791.

It is an arithmetic number, because the mean of its divisors is an integer number (2765088).

Almost surely, 2^21429246 is an apocalyptic number.

21429246 is an abundant number, since it is smaller than the sum of its proper divisors (22812162).

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

21429246 is a wasteful number, since it uses less digits than its factorization.

21429246 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115247.

The product of its digits is 6912, while the sum is 30.

The square root of 21429246 is about 4629.1733603312. The cubic root of 21429246 is about 277.7595267060.

The spelling of 21429246 in words is "twenty-one million, four hundred twenty-nine thousand, two hundred forty-six".