21290035 has 16 divisors (see below), whose sum is σ = 29133216. Its totient is φ = 14796288.

The previous prime is 21290021. The next prime is 21290039. The reversal of 21290035 is 53009212.

It is not a de Polignac number, because 21290035 - 2⁷ = 21289907 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21289988 and 21290015.

It is not an unprimeable number, because it can be changed into a prime (21290039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8529 + ... + 10738.

It is an arithmetic number, because the mean of its divisors is an integer number (1820826).

Almost surely, 2^21290035 is an apocalyptic number.

21290035 is a deficient number, since it is larger than the sum of its proper divisors (7843181).

21290035 is a wasteful number, since it uses less digits than its factorization.

21290035 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19302.

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 21290035 is about 4614.1125907372. The cubic root of 21290035 is about 277.1567489835.

Adding to 21290035 its reverse (53009212), we get a palindrome (74299247).

The spelling of 21290035 in words is "twenty-one million, two hundred ninety thousand, thirty-five".