21641442 has 32 divisors (see below), whose sum is σ = 46039104. Its totient is φ = 6758400.

The previous prime is 21641393. The next prime is 21641467. The reversal of 21641442 is 24414612.

It is a happy number.

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 15 ways as a sum of consecutive naturals, for example, 33442 + ... + 34082.

It is an arithmetic number, because the mean of its divisors is an integer number (1438722).

Almost surely, 2^21641442 is an apocalyptic number.

21641442 is an abundant number, since it is smaller than the sum of its proper divisors (24397662).

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

21641442 is a wasteful number, since it uses less digits than its factorization.

21641442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994.

The product of its digits is 1536, while the sum is 24.

The square root of 21641442 is about 4652.0363283190. The cubic root of 21641442 is about 278.6733243095.

The spelling of 21641442 in words is "twenty-one million, six hundred forty-one thousand, four hundred forty-two".