21201012112021 has 4 divisors (see below), whose sum is σ = 24229728128032. Its totient is φ = 18172296096012.

The previous prime is 21201012111989. The next prime is 21201012112037. The reversal of 21201012112021 is 12021121010212.

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 21201012112021 - 2⁵ = 21201012111989 is a prime.

It is a super-2 number, since 2×21201012112021² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201012111986 and 21201012112004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21201012112081) 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, 1514358007995 + ... + 1514358008008.

It is an arithmetic number, because the mean of its divisors is an integer number (6057432032008).

Almost surely, 2^{21201012112021} is an apocalyptic number.

It is an amenable number.

21201012112021 is a deficient number, since it is larger than the sum of its proper divisors (3028716016011).

21201012112021 is an equidigital number, since it uses as much as digits as its factorization.

21201012112021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3028716016010.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21201012112021 its reverse (12021121010212), we get a palindrome (33222133122233).

The spelling of 21201012112021 in words is "twenty-one trillion, two hundred one billion, twelve million, one hundred twelve thousand, twenty-one".