21702842 has 8 divisors (see below), whose sum is σ = 37204896. Its totient is φ = 9301212.

The previous prime is 21702833. The next prime is 21702851. The reversal of 21702842 is 24820712.

It is an interprime number because it is at equal distance from previous prime (21702833) and next prime (21702851).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21702842³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 775088 + ... + 775115.

It is an arithmetic number, because the mean of its divisors is an integer number (4650612).

Almost surely, 2^21702842 is an apocalyptic number.

21702842 is a deficient number, since it is larger than the sum of its proper divisors (15502054).

21702842 is a wasteful number, since it uses less digits than its factorization.

21702842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1550212.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 21702842 is about 4658.6309147646. The cubic root of 21702842 is about 278.9366213956.

The spelling of 21702842 in words is "twenty-one million, seven hundred two thousand, eight hundred forty-two".