21100121201 has 8 divisors (see below), whose sum is σ = 21805465344. Its totient is φ = 20396320560.

The previous prime is 21100121117. The next prime is 21100121213. The reversal of 21100121201 is 10212100112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100121201 is a prime.

It is a super-2 number, since 2×21100121201² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100121701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 358046 + ... + 412791.

It is an arithmetic number, because the mean of its divisors is an integer number (2725683168).

Almost surely, 2^21100121201 is an apocalyptic number.

It is an amenable number.

21100121201 is a deficient number, since it is larger than the sum of its proper divisors (705344143).

21100121201 is an equidigital number, since it uses as much as digits as its factorization.

21100121201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771751.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21100121201 its reverse (10212100112), we get a palindrome (31312221313).

The spelling of 21100121201 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, two hundred one".