20011210101121 has 4 divisors (see below), whose sum is σ = 20018640928212. Its totient is φ = 20003779274032.

The previous prime is 20011210101083. The next prime is 20011210101151. The reversal of 20011210101121 is 12110101211002.

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 3002720602896 + 17008489498225 = 1732836^2 + 4124135^2 .

It is a cyclic number.

It is not a de Polignac number, because 20011210101121 - 2³¹ = 20009062617473 is a prime.

It is a super-2 number, since 2×20011210101121² (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 (20011210101151) 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, 3715409506 + ... + 3715414891.

It is an arithmetic number, because the mean of its divisors is an integer number (5004660232053).

Almost surely, 2^{20011210101121} is an apocalyptic number.

It is an amenable number.

20011210101121 is a deficient number, since it is larger than the sum of its proper divisors (7430827091).

20011210101121 is an equidigital number, since it uses as much as digits as its factorization.

20011210101121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7430827090.

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

Adding to 20011210101121 its reverse (12110101211002), we get a palindrome (32121311312123).

The spelling of 20011210101121 in words is "twenty trillion, eleven billion, two hundred ten million, one hundred one thousand, one hundred twenty-one".