1000021222021 has 4 divisors (see below), whose sum is σ = 1001038538592. Its totient is φ = 999003905452.

The previous prime is 1000021222001. The next prime is 1000021222051. The reversal of 1000021222021 is 1202221200001.

It is a happy number.

1000021222021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1000021222021 - 2²¹ = 1000019124869 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000021221992 and 1000021222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1000021222001) 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, 508656811 + ... + 508658776.

It is an arithmetic number, because the mean of its divisors is an integer number (250259634648).

Almost surely, 2^{1000021222021} is an apocalyptic number.

It is an amenable number.

1000021222021 is a deficient number, since it is larger than the sum of its proper divisors (1017316571).

1000021222021 is an equidigital number, since it uses as much as digits as its factorization.

1000021222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1017316570.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 1000021222021 its reverse (1202221200001), we get a palindrome (2202242422022).

The spelling of 1000021222021 in words is "one trillion, twenty-one million, two hundred twenty-two thousand, twenty-one".