21012000221101 has 4 divisors (see below), whose sum is σ = 22117894969600. Its totient is φ = 19906105472604.

The previous prime is 21012000221081. The next prime is 21012000221197. The reversal of 21012000221101 is 10112200021012.

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 not a de Polignac number, because 21012000221101 - 2¹¹ = 21012000219053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012000221501) 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, 552947374221 + ... + 552947374258.

It is an arithmetic number, because the mean of its divisors is an integer number (5529473742400).

Almost surely, 2^{21012000221101} is an apocalyptic number.

It is an amenable number.

21012000221101 is a deficient number, since it is larger than the sum of its proper divisors (1105894748499).

21012000221101 is a wasteful number, since it uses less digits than its factorization.

21012000221101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1105894748498.

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

Adding to 21012000221101 its reverse (10112200021012), we get a palindrome (31124200242113).

The spelling of 21012000221101 in words is "twenty-one trillion, twelve billion, two hundred twenty-one thousand, one hundred one".