21672035 has 32 divisors (see below), whose sum is σ = 32707584. Its totient is φ = 13392000.

The previous prime is 21672023. The next prime is 21672041. The reversal of 21672035 is 53027612.

It is not a de Polignac number, because 21672035 - 2⁶ = 21671971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21671995 and 21672013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69530 + ... + 69840.

It is an arithmetic number, because the mean of its divisors is an integer number (1022112).

Almost surely, 2^21672035 is an apocalyptic number.

21672035 is a deficient number, since it is larger than the sum of its proper divisors (11035549).

21672035 is a wasteful number, since it uses less digits than its factorization.

21672035 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 21672035 is about 4655.3232970439. The cubic root of 21672035 is about 278.8045761747.

Adding to 21672035 its reverse (53027612), we get a palindrome (74699647).

The spelling of 21672035 in words is "twenty-one million, six hundred seventy-two thousand, thirty-five".