21011011011121 has 16 divisors (see below), whose sum is σ = 21664898143488. Its totient is φ = 20367338846400.

The previous prime is 21011011011101. The next prime is 21011011011139. The reversal of 21011011011121 is 12111011011012.

It is a cyclic number.

It is not a de Polignac number, because 21011011011121 - 2⁷ = 21011011010993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011011011101) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9871395 + ... + 11809591.

It is an arithmetic number, because the mean of its divisors is an integer number (1354056133968).

Almost surely, 2^{21011011011121} is an apocalyptic number.

It is an amenable number.

21011011011121 is a deficient number, since it is larger than the sum of its proper divisors (653887132367).

21011011011121 is a wasteful number, since it uses less digits than its factorization.

21011011011121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1940832.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 21011011011121 its reverse (12111011011012), we get a palindrome (33122022022133).

The spelling of 21011011011121 in words is "twenty-one trillion, eleven billion, eleven million, eleven thousand, one hundred twenty-one".