21121101201 has 16 divisors (see below), whose sum is σ = 28928700800. Its totient is φ = 13697278848.

The previous prime is 21121101173. The next prime is 21121101247. The reversal of 21121101201 is 10210112112.

It is not a de Polignac number, because 21121101201 - 2¹³ = 21121093009 is a prime.

It is a super-2 number, since 2×21121101201² (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 (21121101601) 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 15 ways as a sum of consecutive naturals, for example, 590805 + ... + 625533.

It is an arithmetic number, because the mean of its divisors is an integer number (1808043800).

Almost surely, 2^21121101201 is an apocalyptic number.

It is an amenable number.

21121101201 is a deficient number, since it is larger than the sum of its proper divisors (7807599599).

21121101201 is a wasteful number, since it uses less digits than its factorization.

21121101201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40248.

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

Adding to 21121101201 its reverse (10210112112), we get a palindrome (31331213313).

The spelling of 21121101201 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, two hundred one".