21247302 has 16 divisors (see below), whose sum is σ = 42561792. Its totient is φ = 7071240.

The previous prime is 21247273. The next prime is 21247309. The reversal of 21247302 is 20374212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21247309) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1927 + ... + 6797.

It is an arithmetic number, because the mean of its divisors is an integer number (2660112).

Almost surely, 2^21247302 is an apocalyptic number.

21247302 is an abundant number, since it is smaller than the sum of its proper divisors (21314490).

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

21247302 is a wasteful number, since it uses less digits than its factorization.

21247302 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5603.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21247302 is about 4609.4795801695. The cubic root of 21247302 is about 276.9711899902.

The spelling of 21247302 in words is "twenty-one million, two hundred forty-seven thousand, three hundred two".