21139703 has 12 divisors (see below), whose sum is σ = 23431320. Its totient is φ = 19053216.

The previous prime is 21139667. The next prime is 21139709. The reversal of 21139703 is 30793112.

It is not a de Polignac number, because 21139703 - 2¹⁸ = 20877559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21139709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5813 + ... + 8721.

It is an arithmetic number, because the mean of its divisors is an integer number (1952610).

Almost surely, 2^21139703 is an apocalyptic number.

21139703 is a deficient number, since it is larger than the sum of its proper divisors (2291617).

21139703 is a wasteful number, since it uses less digits than its factorization.

21139703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2978 (or 2965 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 21139703 is about 4597.7932750397. The cubic root of 21139703 is about 276.5028595985.

The spelling of 21139703 in words is "twenty-one million, one hundred thirty-nine thousand, seven hundred three".