20011121213 has 16 divisors (see below), whose sum is σ = 20347697664. Its totient is φ = 19677729600.

The previous prime is 20011121203. The next prime is 20011121237. The reversal of 20011121213 is 31212111002.

It is a cyclic number.

It is not a de Polignac number, because 20011121213 - 2¹⁴ = 20011104829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011121203) 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 15 ways as a sum of consecutive naturals, for example, 12769556 + ... + 12771122.

It is an arithmetic number, because the mean of its divisors is an integer number (1271731104).

Almost surely, 2^20011121213 is an apocalyptic number.

It is an amenable number.

20011121213 is a deficient number, since it is larger than the sum of its proper divisors (336576451).

20011121213 is a wasteful number, since it uses less digits than its factorization.

20011121213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20011121213 its reverse (31212111002), we get a palindrome (51223232215).

The spelling of 20011121213 in words is "twenty billion, eleven million, one hundred twenty-one thousand, two hundred thirteen".