21421302 has 16 divisors (see below), whose sum is σ = 48963072. Its totient is φ = 6120360.

The previous prime is 21421273. The next prime is 21421319. The reversal of 21421302 is 20312412.

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, 254974 + ... + 255057.

It is an arithmetic number, because the mean of its divisors is an integer number (3060192).

Almost surely, 2^21421302 is an apocalyptic number.

21421302 is an abundant number, since it is smaller than the sum of its proper divisors (27541770).

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

21421302 is a wasteful number, since it uses less digits than its factorization.

21421302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510043.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 21421302 is about 4628.3152442330. The cubic root of 21421302 is about 277.7251998738.

Adding to 21421302 its reverse (20312412), we get a palindrome (41733714).

The spelling of 21421302 in words is "twenty-one million, four hundred twenty-one thousand, three hundred two".