10121000021 has 8 divisors (see below), whose sum is σ = 11150409888. Its totient is φ = 9109810000.

The previous prime is 10120999991. The next prime is 10121000023. The reversal of 10121000021 is 12000012101.

10121000021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 10121000021 - 2⁶ = 10120999957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10120999972 and 10121000008.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10121000023) 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, 4553795 + ... + 4556016.

It is an arithmetic number, because the mean of its divisors is an integer number (1393801236).

Almost surely, 2^10121000021 is an apocalyptic number.

10121000021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

10121000021 is a deficient number, since it is larger than the sum of its proper divisors (1029409867).

10121000021 is a wasteful number, since it uses less digits than its factorization.

10121000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9109923.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 10121000021 its reverse (12000012101), we get a palindrome (22121012122).

The spelling of 10121000021 in words is "ten billion, one hundred twenty-one million, twenty-one", and thus it is an aban number.