21714428 has 6 divisors (see below), whose sum is σ = 38000256. Its totient is φ = 10857212.

The previous prime is 21714421. The next prime is 21714439. The reversal of 21714428 is 82441712.

It is a self number, because there is not a number n which added to its sum of digits gives 21714428.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21714421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2714300 + ... + 2714307.

It is an arithmetic number, because the mean of its divisors is an integer number (6333376).

Almost surely, 2^21714428 is an apocalyptic number.

It is an amenable number.

21714428 is a deficient number, since it is larger than the sum of its proper divisors (16285828).

21714428 is a wasteful number, since it uses less digits than its factorization.

21714428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5428611 (or 5428609 counting only the distinct ones).

The product of its digits is 3584, while the sum is 29.

The square root of 21714428 is about 4659.8742472303. The cubic root of 21714428 is about 278.9862490707.

The spelling of 21714428 in words is "twenty-one million, seven hundred fourteen thousand, four hundred twenty-eight".