1021100100121 has 16 divisors (see below), whose sum is σ = 1081638178560. Its totient is φ = 961936138240.

The previous prime is 1021100100103. The next prime is 1021100100173. The reversal of 1021100100121 is 1210010011201.

It is a cyclic number.

It is not a de Polignac number, because 1021100100121 - 2¹⁹ = 1021099575833 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021100100098 and 1021100100107.

It is not an unprimeable number, because it can be changed into a prime (1021100100421) 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, 1228185 + ... + 1884313.

It is an arithmetic number, because the mean of its divisors is an integer number (67602386160).

Almost surely, 2^{1021100100121} is an apocalyptic number.

It is an amenable number.

1021100100121 is a deficient number, since it is larger than the sum of its proper divisors (60538078439).

1021100100121 is an equidigital number, since it uses as much as digits as its factorization.

1021100100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657176.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 1021100100121 its reverse (1210010011201), we get a palindrome (2231110111322).

The spelling of 1021100100121 in words is "one trillion, twenty-one billion, one hundred million, one hundred thousand, one hundred twenty-one".