1011020121 has 6 divisors (see below), whose sum is σ = 1460362410.
Its totient is φ = 674013408.
The previous prime is 1011020099. The next prime is 1011020123. The reversal of 1011020121 is 1210201101.
It is a happy number.
1011020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It can be written as a sum of positive squares in only one way, i.e., 780587721 + 230432400 = 27939^2 + 15180^2
It is not a de Polignac number, because 1011020121 - 25 = 1011020089 is a prime.
It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 112335569 = 1011020121 / (1 + 0 + 1 + 1 + 0 + 2 + 0 + 1 + 2 + 1).
It is not an unprimeable number, because it can be changed into a prime (1011020123) by changing a digit.
It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 56167776 + ... + 56167793.
It is an arithmetic number, because the mean of its divisors is an integer number (243393735).
Almost surely, 21011020121 is an apocalyptic number.
It is an amenable number.
1011020121 is a deficient number, since it is larger than the sum of its proper divisors (449342289).
1011020121 is a wasteful number, since it uses less digits than its factorization.
1011020121 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 112335575 (or 112335572 counting only the distinct ones).
The product of its (nonzero) digits is 4, while the sum is 9.
The square root of 1011020121 is about 31796.5425950684.
The cubic root of 1011020121 is about 1003.6599620027.
Adding to 1011020121 its reverse (1210201101), we get a palindrome (2221221222).
The spelling of 1011020121 in words is "one billion, eleven million, twenty thousand, one hundred twenty-one".