121020010221 has 16 divisors (see below), whose sum is σ = 177001651008. Its totient is φ = 72940233600.

The previous prime is 121020010217. The next prime is 121020010273. The reversal of 121020010221 is 122010020121.

It is not a de Polignac number, because 121020010221 - 2² = 121020010217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 121020010197 and 121020010206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121020010201) 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, 10124616 + ... + 10136561.

It is an arithmetic number, because the mean of its divisors is an integer number (11062603188).

Almost surely, 2^121020010221 is an apocalyptic number.

121020010221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121020010221 is a deficient number, since it is larger than the sum of its proper divisors (55981640787).

121020010221 is a wasteful number, since it uses less digits than its factorization.

121020010221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20261372.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 121020010221 its reverse (122010020121), we get a palindrome (243030030342).

The spelling of 121020010221 in words is "one hundred twenty-one billion, twenty million, ten thousand, two hundred twenty-one".