2121220021011 has 64 divisors (see below), whose sum is σ = 3532713719808. Its totient is φ = 1102290674688.

The previous prime is 2121220021001. The next prime is 2121220021013. The reversal of 2121220021011 is 1101200221212.

It is not a de Polignac number, because 2121220021011 - 2⁵ = 2121220020979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121220021013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 17417050 + ... + 17538416.

It is an arithmetic number, because the mean of its divisors is an integer number (55198651872).

Almost surely, 2^{2121220021011} is an apocalyptic number.

2121220021011 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

2121220021011 is a deficient number, since it is larger than the sum of its proper divisors (1411493698797).

2121220021011 is a wasteful number, since it uses less digits than its factorization.

2121220021011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122340.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2121220021011 its reverse (1101200221212), we get a palindrome (3222420242223).

The spelling of 2121220021011 in words is "two trillion, one hundred twenty-one billion, two hundred twenty million, twenty-one thousand, eleven".