21021120121011 has 8 divisors (see below), whose sum is σ = 28076735831184. Its totient is φ = 13989792245760.

The previous prime is 21021120120997. The next prime is 21021120121031. The reversal of 21021120121011 is 11012102112012.

It is a happy number.

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

It is not a de Polignac number, because 21021120121011 - 2⁹ = 21021120120499 is a prime.

It is a super-2 number, since 2×21021120121011² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021120121031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6071956710 + ... + 6071960171.

It is an arithmetic number, because the mean of its divisors is an integer number (3509591978898).

Almost surely, 2^{21021120121011} is an apocalyptic number.

21021120121011 is a deficient number, since it is larger than the sum of its proper divisors (7055615710173).

21021120121011 is a wasteful number, since it uses less digits than its factorization.

21021120121011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12143917461.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21021120121011 its reverse (11012102112012), we get a palindrome (32033222233023).

The spelling of 21021120121011 in words is "twenty-one trillion, twenty-one billion, one hundred twenty million, one hundred twenty-one thousand, eleven".