21601126 has 16 divisors (see below), whose sum is σ = 32886000. Its totient is φ = 10640608.

The previous prime is 21601121. The next prime is 21601171. The reversal of 21601126 is 62110612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21601121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51345 + ... + 51763.

It is an arithmetic number, because the mean of its divisors is an integer number (2055375).

Almost surely, 2^21601126 is an apocalyptic number.

21601126 is a deficient number, since it is larger than the sum of its proper divisors (11284874).

21601126 is a wasteful number, since it uses less digits than its factorization.

21601126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 21601126 is about 4647.7011521827. The cubic root of 21601126 is about 278.5001692188.

Adding to 21601126 its reverse (62110612), we get a palindrome (83711738).

The spelling of 21601126 in words is "twenty-one million, six hundred one thousand, one hundred twenty-six".