1021000222021 has 8 divisors (see below), whose sum is σ = 1099665657720. Its totient is φ = 942352923072.

The previous prime is 1021000221973. The next prime is 1021000222043. The reversal of 1021000222021 is 1202220001201.

It is a happy number.

1021000222021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 136674393025 + 884325828996 = 369695^2 + 940386^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1021000222021 - 2⁷ = 1021000221893 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021000221992 and 1021000222010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021000222051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4417150 + ... + 4642543.

It is an arithmetic number, because the mean of its divisors is an integer number (137458207215).

Almost surely, 2^{1021000222021} is an apocalyptic number.

It is an amenable number.

1021000222021 is a deficient number, since it is larger than the sum of its proper divisors (78665435699).

1021000222021 is an equidigital number, since it uses as much as digits as its factorization.

1021000222021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9068375.

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

Adding to 1021000222021 its reverse (1202220001201), we get a palindrome (2223220223222).

The spelling of 1021000222021 in words is "one trillion, twenty-one billion, two hundred twenty-two thousand, twenty-one".