21601442 has 16 divisors (see below), whose sum is σ = 34670400. Its totient is φ = 10063440.

The previous prime is 21601429. The next prime is 21601453. The reversal of 21601442 is 24410612.

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 7 ways as a sum of consecutive naturals, for example, 2342 + ... + 6977.

It is an arithmetic number, because the mean of its divisors is an integer number (2166900).

Almost surely, 2^21601442 is an apocalyptic number.

21601442 is a deficient number, since it is larger than the sum of its proper divisors (13068958).

21601442 is a wasteful number, since it uses less digits than its factorization.

21601442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9401.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 21601442 is about 4647.7351473594. The cubic root of 21601442 is about 278.5015272595.

The spelling of 21601442 in words is "twenty-one million, six hundred one thousand, four hundred forty-two".