1021202100021 has 8 divisors (see below), whose sum is σ = 1393267981600. Its totient is φ = 664968809232.

The previous prime is 1021202100001. The next prime is 1021202100041. The reversal of 1021202100021 is 1200012021201.

It is an interprime number because it is at equal distance from previous prime (1021202100001) and next prime (1021202100041).

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

It is not a de Polignac number, because 1021202100021 - 2⁷ = 1021202099893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021202100001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3958147546 + ... + 3958147803.

It is an arithmetic number, because the mean of its divisors is an integer number (174158497700).

Almost surely, 2^{1021202100021} is an apocalyptic number.

It is an amenable number.

1021202100021 is a deficient number, since it is larger than the sum of its proper divisors (372065881579).

1021202100021 is an equidigital number, since it uses as much as digits as its factorization.

1021202100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7916295395.

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

Adding to 1021202100021 its reverse (1200012021201), we get a palindrome (2221214121222).

The spelling of 1021202100021 in words is "one trillion, twenty-one billion, two hundred two million, one hundred thousand, twenty-one".