21112101211021 has 4 divisors (see below), whose sum is σ = 21212158562944. Its totient is φ = 21012043859100.

The previous prime is 21112101211007. The next prime is 21112101211031. The reversal of 21112101211021 is 12011210121112.

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 21112101211021 - 2³³ = 21103511276429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112101210986 and 21112101211004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112101211031) 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, 50028675645 + ... + 50028676066.

It is an arithmetic number, because the mean of its divisors is an integer number (5303039640736).

Almost surely, 2^{21112101211021} is an apocalyptic number.

It is an amenable number.

21112101211021 is a deficient number, since it is larger than the sum of its proper divisors (100057351923).

21112101211021 is a wasteful number, since it uses less digits than its factorization.

21112101211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100057351922.

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

Adding to 21112101211021 its reverse (12011210121112), we get a palindrome (33123311332133).

The spelling of 21112101211021 in words is "twenty-one trillion, one hundred twelve billion, one hundred one million, two hundred eleven thousand, twenty-one".