21101121201 has 24 divisors (see below), whose sum is σ = 29913045120. Its totient is φ = 13215166272.

The previous prime is 21101121193. The next prime is 21101121203. The reversal of 21101121201 is 10212110112.

It is not a de Polignac number, because 21101121201 - 2³ = 21101121193 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21101121203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30520 + ... + 207686.

It is an arithmetic number, because the mean of its divisors is an integer number (1246376880).

Almost surely, 2^21101121201 is an apocalyptic number.

It is an amenable number.

21101121201 is a deficient number, since it is larger than the sum of its proper divisors (8811923919).

21101121201 is a wasteful number, since it uses less digits than its factorization.

21101121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 177273 (or 177236 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21101121201 its reverse (10212110112), we get a palindrome (31313231313).

The spelling of 21101121201 in words is "twenty-one billion, one hundred one million, one hundred twenty-one thousand, two hundred one".