21204541101 has 24 divisors (see below), whose sum is σ = 29910597024. Its totient is φ = 13360243680.

The previous prime is 21204541097. The next prime is 21204541121. The reversal of 21204541101 is 10114540212.

It is not a de Polignac number, because 21204541101 - 2² = 21204541097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21204541121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 432690 + ... + 479196.

It is an arithmetic number, because the mean of its divisors is an integer number (1246274876).

Almost surely, 2^21204541101 is an apocalyptic number.

It is an amenable number.

21204541101 is a deficient number, since it is larger than the sum of its proper divisors (8706055923).

21204541101 is a wasteful number, since it uses less digits than its factorization.

21204541101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46969 (or 46950 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The spelling of 21204541101 in words is "twenty-one billion, two hundred four million, five hundred forty-one thousand, one hundred one".