10121220021 has 16 divisors (see below), whose sum is σ = 14737978368. Its totient is φ = 6127321200.

The previous prime is 10121220017. The next prime is 10121220059. The reversal of 10121220021 is 12002212101.

It is not a de Polignac number, because 10121220021 - 2² = 10121220017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10121219979 and 10121220006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121220001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138271 + ... + 198396.

It is an arithmetic number, because the mean of its divisors is an integer number (921123648).

Almost surely, 2^10121220021 is an apocalyptic number.

10121220021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121220021 is a deficient number, since it is larger than the sum of its proper divisors (4616758347).

10121220021 is a wasteful number, since it uses less digits than its factorization.

10121220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 337592.

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

Adding to 10121220021 its reverse (12002212101), we get a palindrome (22123432122).

The spelling of 10121220021 in words is "ten billion, one hundred twenty-one million, two hundred twenty thousand, twenty-one".