1021100102021 has 4 divisors (see below), whose sum is σ = 1021213958700. Its totient is φ = 1020986245344.

The previous prime is 1021100101997. The next prime is 1021100102023. The reversal of 1021100102021 is 1202010011201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 728376902500 + 292723199521 = 853450^2 + 541039^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021100102021 - 2³⁸ = 746222195077 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021100101993 and 1021100102011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021100102023) 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, 56914886 + ... + 56932823.

It is an arithmetic number, because the mean of its divisors is an integer number (255303489675).

Almost surely, 2^{1021100102021} is an apocalyptic number.

It is an amenable number.

1021100102021 is a deficient number, since it is larger than the sum of its proper divisors (113856679).

1021100102021 is an equidigital number, since it uses as much as digits as its factorization.

1021100102021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113856678.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1021100102021 its reverse (1202010011201), we get a palindrome (2223110113222).

The spelling of 1021100102021 in words is "one trillion, twenty-one billion, one hundred million, one hundred two thousand, twenty-one".