2111002010021 has 4 divisors (see below), whose sum is σ = 2129683443852. Its totient is φ = 2092320576192.

The previous prime is 2111002010009. The next prime is 2111002010053. The reversal of 2111002010021 is 1200102001112.

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 946653107521 + 1164348902500 = 972961^2 + 1079050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2111002010021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2111002009984 and 2111002010011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2111002010321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9340716746 + ... + 9340716971.

It is an arithmetic number, because the mean of its divisors is an integer number (532420860963).

Almost surely, 2^{2111002010021} is an apocalyptic number.

It is an amenable number.

2111002010021 is a deficient number, since it is larger than the sum of its proper divisors (18681433831).

2111002010021 is a wasteful number, since it uses less digits than its factorization.

2111002010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18681433830.

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

Adding to 2111002010021 its reverse (1200102001112), we get a palindrome (3311104011133).

The spelling of 2111002010021 in words is "two trillion, one hundred eleven billion, two million, ten thousand, twenty-one".