21111022020001 has 4 divisors (see below), whose sum is σ = 21262899876400. Its totient is φ = 20959144163604.

The previous prime is 21111022019959. The next prime is 21111022020089. The reversal of 21111022020001 is 10002022011112.

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 21111022020001 - 2¹³ = 21111022011809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21111022020401) 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, 75938927991 + ... + 75938928268.

It is an arithmetic number, because the mean of its divisors is an integer number (5315724969100).

Almost surely, 2^{21111022020001} is an apocalyptic number.

It is an amenable number.

21111022020001 is a deficient number, since it is larger than the sum of its proper divisors (151877856399).

21111022020001 is a wasteful number, since it uses less digits than its factorization.

21111022020001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151877856398.

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

Adding to 21111022020001 its reverse (10002022011112), we get a palindrome (31113044031113).

The spelling of 21111022020001 in words is "twenty-one trillion, one hundred eleven billion, twenty-two million, twenty thousand, one".