121221020011 has 16 divisors (see below), whose sum is σ = 150992642304. Its totient is φ = 94755574944.

The previous prime is 121221020009. The next prime is 121221020051. The reversal of 121221020011 is 110020122121.

It is a cyclic number.

It is not a de Polignac number, because 121221020011 - 2¹ = 121221020009 is a prime.

It is a super-4 number, since 4×121221020011⁴ (a number of 45 digits) contains 4444 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 121221019973 and 121221020000.

It is not an unprimeable number, because it can be changed into a prime (121221020051) 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, 8017141 + ... + 8032246.

It is an arithmetic number, because the mean of its divisors is an integer number (9437040144).

Almost surely, 2^121221020011 is an apocalyptic number.

121221020011 is a deficient number, since it is larger than the sum of its proper divisors (29771622293).

121221020011 is a wasteful number, since it uses less digits than its factorization.

121221020011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16049490.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 121221020011 its reverse (110020122121), we get a palindrome (231241142132).

The spelling of 121221020011 in words is "one hundred twenty-one billion, two hundred twenty-one million, twenty thousand, eleven".