21121020212011 has 8 divisors (see below), whose sum is σ = 21169230405120. Its totient is φ = 21072862338792.

The previous prime is 21121020211979. The next prime is 21121020212023. The reversal of 21121020212011 is 11021202012112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21121020212011 - 2⁵ = 21121020211979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121020212051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12271615 + ... + 13886488.

It is an arithmetic number, because the mean of its divisors is an integer number (2646153800640).

Almost surely, 2^{21121020212011} is an apocalyptic number.

21121020212011 is a deficient number, since it is larger than the sum of its proper divisors (48210193109).

21121020212011 is a wasteful number, since it uses less digits than its factorization.

21121020212011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26159945.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21121020212011 its reverse (11021202012112), we get a palindrome (32142222224123).

The spelling of 21121020212011 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, eleven".