21121113010201 has 4 divisors (see below), whose sum is σ = 21121127331172. Its totient is φ = 21121098689232.

The previous prime is 21121113010189. The next prime is 21121113010211. The reversal of 21121113010201 is 10201031112112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 471577491225 + 20649535518976 = 686715^2 + 4544176^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121113010201 - 2⁴³ = 12325019987993 is a prime.

It is a super-2 number, since 2×21121113010201² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121113010211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4656306 + ... + 7995211.

It is an arithmetic number, because the mean of its divisors is an integer number (5280281832793).

Almost surely, 2^{21121113010201} is an apocalyptic number.

It is an amenable number.

21121113010201 is a deficient number, since it is larger than the sum of its proper divisors (14320971).

21121113010201 is a wasteful number, since it uses less digits than its factorization.

21121113010201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14320970.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21121113010201 its reverse (10201031112112), we get a palindrome (31322144122313).

The spelling of 21121113010201 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred thirteen million, ten thousand, two hundred one".