1020121001 has 8 divisors (see below), whose sum is σ = 1120499520. Its totient is φ = 924411312.

The previous prime is 1020120979. The next prime is 1020121007. The reversal of 1020121001 is 1001210201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020121001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020121001.

It is not an unprimeable number, because it can be changed into a prime (1020121007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1166750 + ... + 1167623.

It is an arithmetic number, because the mean of its divisors is an integer number (140062440).

Almost surely, 2^1020121001 is an apocalyptic number.

It is an amenable number.

1020121001 is a deficient number, since it is larger than the sum of its proper divisors (100378519).

1020121001 is a wasteful number, since it uses less digits than its factorization.

1020121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334415.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1020121001 is about 31939.3331333013. Note that the first 3 decimals coincide. The cubic root of 1020121001 is about 1006.6625126772.

Adding to 1020121001 its reverse (1001210201), we get a palindrome (2021331202).

The spelling of 1020121001 in words is "one billion, twenty million, one hundred twenty-one thousand, one".