21114200035721 has 4 divisors (see below), whose sum is σ = 22738369269252. Its totient is φ = 19490030802192.

The previous prime is 21114200035717. The next prime is 21114200035723. The reversal of 21114200035721 is 12753000241112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2466269230096 + 18647930805625 = 1570436^2 + 4318325^2 .

It is a cyclic number.

It is not a de Polignac number, because 21114200035721 - 2² = 21114200035717 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114200035723) 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, 812084616746 + ... + 812084616771.

It is an arithmetic number, because the mean of its divisors is an integer number (5684592317313).

Almost surely, 2^{21114200035721} is an apocalyptic number.

It is an amenable number.

21114200035721 is a deficient number, since it is larger than the sum of its proper divisors (1624169233531).

21114200035721 is a wasteful number, since it uses less digits than its factorization.

21114200035721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1624169233530.

The product of its (nonzero) digits is 3360, while the sum is 29.

Adding to 21114200035721 its reverse (12753000241112), we get a palindrome (33867200276833).

The spelling of 21114200035721 in words is "twenty-one trillion, one hundred fourteen billion, two hundred million, thirty-five thousand, seven hundred twenty-one".