1210020002001 has 6 divisors (see below), whose sum is σ = 1747806669570. Its totient is φ = 806680001328.

The previous prime is 1210020001991. The next prime is 1210020002011. The reversal of 1210020002001 is 1002000200121.

It is an interprime number because it is at equal distance from previous prime (1210020001991) and next prime (1210020002011).

It can be written as a sum of positive squares in only one way, i.e., 1159282890000 + 50737112001 = 1076700^2 + 225249^2 .

It is not a de Polignac number, because 1210020002001 - 2¹⁴ = 1210019985617 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: 134446666889 = 1210020002001 / (1 + 2 + 1 + 0 + 0 + 2 + 0 + 0 + 0 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1210020002011) 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, 67223333436 + ... + 67223333453.

It is an arithmetic number, because the mean of its divisors is an integer number (291301111595).

Almost surely, 2^{1210020002001} is an apocalyptic number.

It is an amenable number.

1210020002001 is a deficient number, since it is larger than the sum of its proper divisors (537786667569).

1210020002001 is a wasteful number, since it uses less digits than its factorization.

1210020002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134446666895 (or 134446666892 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 1210020002001 its reverse (1002000200121), we get a palindrome (2212020202122).

The spelling of 1210020002001 in words is "one trillion, two hundred ten billion, twenty million, two thousand, one".