1000201220021 has 4 divisors (see below), whose sum is σ = 1000404559200. Its totient is φ = 999997880844.

The previous prime is 1000201219991. The next prime is 1000201220033. The reversal of 1000201220021 is 1200221020001.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 1000201220021 - 2¹⁴ = 1000201203637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000201219984 and 1000201220011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000201220321) 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, 101662211 + ... + 101672048.

It is an arithmetic number, because the mean of its divisors is an integer number (250101139800).

Almost surely, 2^{1000201220021} is an apocalyptic number.

It is an amenable number.

1000201220021 is a deficient number, since it is larger than the sum of its proper divisors (203339179).

1000201220021 is an equidigital number, since it uses as much as digits as its factorization.

1000201220021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203339178.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 1000201220021 its reverse (1200221020001), we get a palindrome (2200422240022).

The spelling of 1000201220021 in words is "one trillion, two hundred one million, two hundred twenty thousand, twenty-one".