1000201121021 has 4 divisors (see below), whose sum is σ = 1032465673344. Its totient is φ = 967936568700.

The previous prime is 1000201121009. The next prime is 1000201121033. The reversal of 1000201121021 is 1201211020001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1000201121009) and next prime (1000201121033).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1000201121021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000201120993 and 1000201121011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000201120021) 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, 16132276115 + ... + 16132276176.

It is an arithmetic number, because the mean of its divisors is an integer number (258116418336).

Almost surely, 2^{1000201121021} is an apocalyptic number.

It is an amenable number.

1000201121021 is a deficient number, since it is larger than the sum of its proper divisors (32264552323).

1000201121021 is an equidigital number, since it uses as much as digits as its factorization.

1000201121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32264552322.

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

Adding to 1000201121021 its reverse (1201211020001), we get a palindrome (2201412141022).

The spelling of 1000201121021 in words is "one trillion, two hundred one million, one hundred twenty-one thousand, twenty-one".