21701799 has 24 divisors (see below), whose sum is σ = 36662912. Its totient is φ = 12111120.

The previous prime is 21701749. The next prime is 21701803. The reversal of 21701799 is 99710712.

It is not a de Polignac number, because 21701799 - 2¹¹ = 21699751 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 (21701749) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1297 + ... + 6714.

Almost surely, 2^21701799 is an apocalyptic number.

21701799 is a deficient number, since it is larger than the sum of its proper divisors (14961113).

21701799 is a wasteful number, since it uses less digits than its factorization.

21701799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8067 (or 8064 counting only the distinct ones).

The product of its (nonzero) digits is 7938, while the sum is 36.

The square root of 21701799 is about 4658.5189706601. The cubic root of 21701799 is about 278.9321529246.

It can be divided in two parts, 21701 and 799, that added together give a square (22500 = 150²).

The spelling of 21701799 in words is "twenty-one million, seven hundred one thousand, seven hundred ninety-nine".