21278702 has 4 divisors (see below), whose sum is σ = 31918056. Its totient is φ = 10639350.

The previous prime is 21278701. The next prime is 21278711. The reversal of 21278702 is 20787212.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21278701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5319674 + ... + 5319677.

It is an arithmetic number, because the mean of its divisors is an integer number (7979514).

Almost surely, 2^21278702 is an apocalyptic number.

21278702 is a deficient number, since it is larger than the sum of its proper divisors (10639354).

21278702 is a wasteful number, since it uses less digits than its factorization.

21278702 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10639353.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 21278702 is about 4612.8843471303. The cubic root of 21278702 is about 277.1075620449.

The spelling of 21278702 in words is "twenty-one million, two hundred seventy-eight thousand, seven hundred two".