21735801 has 12 divisors (see below), whose sum is σ = 31437120. Its totient is φ = 14471640.

The previous prime is 21735787. The next prime is 21735803. The reversal of 21735801 is 10853712.

It is not a de Polignac number, because 21735801 - 2⁶ = 21735737 is a prime.

It is a super-2 number, since 2×21735801² = 944890090223202, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21735803) 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, 10956 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (2619760).

Almost surely, 2^21735801 is an apocalyptic number.

It is an amenable number.

21735801 is a deficient number, since it is larger than the sum of its proper divisors (9701319).

21735801 is a wasteful number, since it uses less digits than its factorization.

21735801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3156 (or 3153 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 21735801 is about 4662.1669854264. The cubic root of 21735801 is about 279.0777522536.

The spelling of 21735801 in words is "twenty-one million, seven hundred thirty-five thousand, eight hundred one".