1201000001021 has 4 divisors (see below), whose sum is σ = 1201775341500. Its totient is φ = 1200224660544.

The previous prime is 1201000000957. The next prime is 1201000001023.

1201000001021 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 483233522500 + 717766478521 = 695150^2 + 847211^2 .

It is a cyclic number.

It is not a de Polignac number, because 1201000001021 - 2⁶ = 1201000000957 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1201000001023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 387667916 + ... + 387671013.

It is an arithmetic number, because the mean of its divisors is an integer number (300443835375).

Almost surely, 2^{1201000001021} is an apocalyptic number.

It is an amenable number.

1201000001021 is a deficient number, since it is larger than the sum of its proper divisors (775340479).

1201000001021 is an equidigital number, since it uses as much as digits as its factorization.

1201000001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775340478.

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

It can be divided in two parts, 120100000 and 1021, that added together give a palindrome (120101021).

The spelling of 1201000001021 in words is "one trillion, two hundred one billion, one thousand, twenty-one".