21641034 has 16 divisors (see below), whose sum is σ = 45828288. Its totient is φ = 6789312.

The previous prime is 21641027. The next prime is 21641093. The reversal of 21641034 is 43014612.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 21641034.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105982 + ... + 106185.

It is an arithmetic number, because the mean of its divisors is an integer number (2864268).

Almost surely, 2^21641034 is an apocalyptic number.

21641034 is an abundant number, since it is smaller than the sum of its proper divisors (24187254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21641034 is a wasteful number, since it uses less digits than its factorization.

21641034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212189.

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 21641034 is about 4651.9924763482. The cubic root of 21641034 is about 278.6715730486.

Adding to 21641034 its reverse (43014612), we get a palindrome (64655646).

The spelling of 21641034 in words is "twenty-one million, six hundred forty-one thousand, thirty-four".