1002121100021 has 4 divisors (see below), whose sum is σ = 1010011817472. Its totient is φ = 994230382572.

The previous prime is 1002121099979. The next prime is 1002121100033. The reversal of 1002121100021 is 1200011212001.

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 1002121100021 - 2¹⁴ = 1002121083637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1002121099975 and 1002121100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002121100081) 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, 3945358535 + ... + 3945358788.

It is an arithmetic number, because the mean of its divisors is an integer number (252502954368).

Almost surely, 2^{1002121100021} is an apocalyptic number.

It is an amenable number.

1002121100021 is a deficient number, since it is larger than the sum of its proper divisors (7890717451).

1002121100021 is an equidigital number, since it uses as much as digits as its factorization.

1002121100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7890717450.

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

Adding to 1002121100021 its reverse (1200011212001), we get a palindrome (2202132312022).

The spelling of 1002121100021 in words is "one trillion, two billion, one hundred twenty-one million, one hundred thousand, twenty-one".