21200101112021 has 16 divisors (see below), whose sum is σ = 22846612984944. Its totient is φ = 19555841746944.

The previous prime is 21200101111997. The next prime is 21200101112023. The reversal of 21200101112021 is 12021110100212.

It can be written as a sum of positive squares in 8 ways, for example, as 5006607627025 + 16193493484996 = 2237545^2 + 4024114^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21200101112021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21200101111987 and 21200101112005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200101112023) 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, 112267535 + ... + 112456211.

It is an arithmetic number, because the mean of its divisors is an integer number (1427913311559).

Almost surely, 2^{21200101112021} is an apocalyptic number.

It is an amenable number.

21200101112021 is a deficient number, since it is larger than the sum of its proper divisors (1646511872923).

21200101112021 is a wasteful number, since it uses less digits than its factorization.

21200101112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194600.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21200101112021 its reverse (12021110100212), we get a palindrome (33221211212233).

The spelling of 21200101112021 in words is "twenty-one trillion, two hundred billion, one hundred one million, one hundred twelve thousand, twenty-one".