21100211002021 has 16 divisors (see below), whose sum is σ = 22530647784960. Its totient is φ = 19701940955760.

The previous prime is 21100211002009. The next prime is 21100211002033. The reversal of 21100211002021 is 12020011200112.

It is an interprime number because it is at equal distance from previous prime (21100211002009) and next prime (21100211002033).

It is a cyclic number.

It is not a de Polignac number, because 21100211002021 - 2⁹ = 21100211001509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100211001992 and 21100211002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100211002081) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1845330 + ... + 6753196.

It is an arithmetic number, because the mean of its divisors is an integer number (1408165486560).

Almost surely, 2^{21100211002021} is an apocalyptic number.

It is an amenable number.

21100211002021 is a deficient number, since it is larger than the sum of its proper divisors (1430436782939).

21100211002021 is a wasteful number, since it uses less digits than its factorization.

21100211002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4911144.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21100211002021 its reverse (12020011200112), we get a palindrome (33120222202133).

The spelling of 21100211002021 in words is "twenty-one trillion, one hundred billion, two hundred eleven million, two thousand, twenty-one".