21121101001201 has 4 divisors (see below), whose sum is σ = 22363518707172. Its totient is φ = 19878683295232.

The previous prime is 21121101001199. The next prime is 21121101001213. The reversal of 21121101001201 is 10210010112112.

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 5829090751201 + 15292010250000 = 2414351^2 + 3910500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121101001201 - 2¹ = 21121101001199 is a prime.

It is a super-2 number, since 2×21121101001201² (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 (21121101001001) 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, 621208852960 + ... + 621208852993.

It is an arithmetic number, because the mean of its divisors is an integer number (5590879676793).

Almost surely, 2^{21121101001201} is an apocalyptic number.

It is an amenable number.

21121101001201 is a deficient number, since it is larger than the sum of its proper divisors (1242417705971).

21121101001201 is a wasteful number, since it uses less digits than its factorization.

21121101001201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1242417705970.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21121101001201 its reverse (10210010112112), we get a palindrome (31331111113313).

The spelling of 21121101001201 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, one thousand, two hundred one".