21112021101001 has 4 divisors (see below), whose sum is σ = 21602998335952. Its totient is φ = 20621043866052.

The previous prime is 21112021100959. The next prime is 21112021101013. The reversal of 21112021101001 is 10010112021112.

It is a happy number.

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 21112021101001 - 2²¹ = 21112019003849 is a prime.

It is a super-2 number, since 2×21112021101001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21112021111001) 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, 245488617411 + ... + 245488617496.

It is an arithmetic number, because the mean of its divisors is an integer number (5400749583988).

Almost surely, 2^{21112021101001} is an apocalyptic number.

It is an amenable number.

21112021101001 is a deficient number, since it is larger than the sum of its proper divisors (490977234951).

21112021101001 is an equidigital number, since it uses as much as digits as its factorization.

21112021101001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490977234950.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21112021101001 its reverse (10010112021112), we get a palindrome (31122133122113).

The spelling of 21112021101001 in words is "twenty-one trillion, one hundred twelve billion, twenty-one million, one hundred one thousand, one".