1021021022021 has 64 divisors (see below), whose sum is σ = 1426551436800. Its totient is φ = 709073164800.

The previous prime is 1021021022017. The next prime is 1021021022041. The reversal of 1021021022021 is 1202201201201.

It is not a de Polignac number, because 1021021022021 - 2² = 1021021022017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1021021021987 and 1021021022005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021021022041) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4801841 + ... + 5009961.

It is an arithmetic number, because the mean of its divisors is an integer number (22289866200).

Almost surely, 2^{1021021022021} is an apocalyptic number.

1021021022021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1021021022021 is a deficient number, since it is larger than the sum of its proper divisors (405530414779).

1021021022021 is a wasteful number, since it uses less digits than its factorization.

1021021022021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208207 (or 208181 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 1021021022021 its reverse (1202201201201), we get a palindrome (2223222223222).

The spelling of 1021021022021 in words is "one trillion, twenty-one billion, twenty-one million, twenty-two thousand, twenty-one".