1001021100121 has 32 divisors (see below), whose sum is σ = 1257118156800. Its totient is φ = 777193211520.

The previous prime is 1001021100119. The next prime is 1001021100127. The reversal of 1001021100121 is 1210011201001.

It is a cyclic number.

It is not a de Polignac number, because 1001021100121 - 2¹ = 1001021100119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001021100098 and 1001021100107.

It is not an unprimeable number, because it can be changed into a prime (1001021100127) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7399990 + ... + 7534048.

It is an arithmetic number, because the mean of its divisors is an integer number (39284942400).

Almost surely, 2^{1001021100121} is an apocalyptic number.

It is an amenable number.

1001021100121 is a deficient number, since it is larger than the sum of its proper divisors (256097056679).

1001021100121 is a wasteful number, since it uses less digits than its factorization.

1001021100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136549.

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

Adding to 1001021100121 its reverse (1210011201001), we get a palindrome (2211032301122).

The spelling of 1001021100121 in words is "one trillion, one billion, twenty-one million, one hundred thousand, one hundred twenty-one".