21228702 has 16 divisors (see below), whose sum is σ = 46317312. Its totient is φ = 6432920.

The previous prime is 21228677. The next prime is 21228703. The reversal of 21228702 is 20782212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21228703) 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, 160758 + ... + 160889.

It is an arithmetic number, because the mean of its divisors is an integer number (2894832).

Almost surely, 2^21228702 is an apocalyptic number.

21228702 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21228702 is an abundant number, since it is smaller than the sum of its proper divisors (25088610).

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

21228702 is a wasteful number, since it uses less digits than its factorization.

21228702 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321663.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21228702 is about 4607.4615570832. The cubic root of 21228702 is about 276.8903457160.

The spelling of 21228702 in words is "twenty-one million, two hundred twenty-eight thousand, seven hundred two".