1020010100121 has 12 divisors (see below), whose sum is σ = 1473447578148. Its totient is φ = 679960738464.

The previous prime is 1020010100119. The next prime is 1020010100167. The reversal of 1020010100121 is 1210010100201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 475011802521 + 544998297600 = 689211^2 + 738240^2 .

It is not a de Polignac number, because 1020010100121 - 2¹ = 1020010100119 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (1020010100191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3692190 + ... + 3958823.

It is an arithmetic number, because the mean of its divisors is an integer number (122787298179).

Almost surely, 2^{1020010100121} is an apocalyptic number.

It is an amenable number.

1020010100121 is a deficient number, since it is larger than the sum of its proper divisors (453437478027).

1020010100121 is a wasteful number, since it uses less digits than its factorization.

1020010100121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665832 (or 7665829 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1020010100121 its reverse (1210010100201), we get a palindrome (2230020200322).

The spelling of 1020010100121 in words is "one trillion, twenty billion, ten million, one hundred thousand, one hundred twenty-one".