21114405442251 has 24 divisors (see below), whose sum is σ = 33546152817840. Its totient is φ = 12796609351680.

The previous prime is 21114405442211. The next prime is 21114405442279. The reversal of 21114405442251 is 15224450441112.

It is a happy number.

21114405442251 is a `hidden beast` number, since 2 + 1 + 1 + 1 + 4 + 40 + 544 + 22 + 51 = 666.

It is not a de Polignac number, because 21114405442251 - 2¹¹ = 21114405440203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21114405442211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 881297206 + ... + 881321163.

It is an arithmetic number, because the mean of its divisors is an integer number (1397756367410).

Almost surely, 2^{21114405442251} is an apocalyptic number.

21114405442251 is a deficient number, since it is larger than the sum of its proper divisors (12431747375589).

21114405442251 is a wasteful number, since it uses less digits than its factorization.

21114405442251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1762618408 (or 1762618383 counting only the distinct ones).

The product of its (nonzero) digits is 51200, while the sum is 36.

Adding to 21114405442251 its reverse (15224450441112), we get a palindrome (36338855883363).

The spelling of 21114405442251 in words is "twenty-one trillion, one hundred fourteen billion, four hundred five million, four hundred forty-two thousand, two hundred fifty-one".