1001220210021 has 4 divisors (see below), whose sum is σ = 1334960280032. Its totient is φ = 667480140012.

The previous prime is 1001220209987. The next prime is 1001220210037. The reversal of 1001220210021 is 1200120221001.

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 not a de Polignac number, because 1001220210021 - 2¹⁷ = 1001220078949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001220209979 and 1001220210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001220210091) 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, 166870035001 + ... + 166870035006.

It is an arithmetic number, because the mean of its divisors is an integer number (333740070008).

Almost surely, 2^{1001220210021} is an apocalyptic number.

It is an amenable number.

1001220210021 is a deficient number, since it is larger than the sum of its proper divisors (333740070011).

1001220210021 is an equidigital number, since it uses as much as digits as its factorization.

1001220210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333740070010.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1001220210021 its reverse (1200120221001), we get a palindrome (2201340431022).

The spelling of 1001220210021 in words is "one trillion, one billion, two hundred twenty million, two hundred ten thousand, twenty-one".