1020001210121 has 8 divisors (see below), whose sum is σ = 1030618903944. Its totient is φ = 1009385602560.

The previous prime is 1020001210087. The next prime is 1020001210139. The reversal of 1020001210121 is 1210121000201.

It can be written as a sum of positive squares in 4 ways, for example, as 280676384521 + 739324825600 = 529789^2 + 859840^2 .

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-1020001210121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020001210171) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471131 + ... + 1503983.

It is an arithmetic number, because the mean of its divisors is an integer number (128827362993).

Almost surely, 2^{1020001210121} is an apocalyptic number.

It is an amenable number.

1020001210121 is a deficient number, since it is larger than the sum of its proper divisors (10617693823).

1020001210121 is a wasteful number, since it uses less digits than its factorization.

1020001210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1043131.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1020001210121 its reverse (1210121000201), we get a palindrome (2230122210322).

The spelling of 1020001210121 in words is "one trillion, twenty billion, one million, two hundred ten thousand, one hundred twenty-one".