10100121221021 has 4 divisors (see below), whose sum is σ = 10877053622652. Its totient is φ = 9323188819392.

The previous prime is 10100121221017. The next prime is 10100121221023. The reversal of 10100121221021 is 12012212100101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4811271158521 + 5288850062500 = 2193461^2 + 2299750^2 .

It is a cyclic number.

It is not a de Polignac number, because 10100121221021 - 2² = 10100121221017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 10100121220987 and 10100121221005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10100121221023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388466200796 + ... + 388466200821.

It is an arithmetic number, because the mean of its divisors is an integer number (2719263405663).

Almost surely, 2^{10100121221021} is an apocalyptic number.

It is an amenable number.

10100121221021 is a deficient number, since it is larger than the sum of its proper divisors (776932401631).

10100121221021 is an equidigital number, since it uses as much as digits as its factorization.

10100121221021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776932401630.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 10100121221021 its reverse (12012212100101), we get a palindrome (22112333321122).

The spelling of 10100121221021 in words is "ten trillion, one hundred billion, one hundred twenty-one million, two hundred twenty-one thousand, twenty-one".