21242450511 has 12 divisors (see below), whose sum is σ = 31397110888. Its totient is φ = 13832293104.

The previous prime is 21242450501. The next prime is 21242450549. The reversal of 21242450511 is 11505424212.

It is a happy number.

21242450511 is a `hidden beast` number, since 2 + 124 + 24 + 5 + 0 + 511 = 666.

It is not a de Polignac number, because 21242450511 - 2⁹ = 21242449999 is a prime.

It is a super-2 number, since 2×21242450511² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21242450501) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27444640 + ... + 27445413.

Almost surely, 2^21242450511 is an apocalyptic number.

21242450511 is a deficient number, since it is larger than the sum of its proper divisors (10154660377).

21242450511 is a wasteful number, since it uses less digits than its factorization.

21242450511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54890102 (or 54890099 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

Adding to 21242450511 its reverse (11505424212), we get a palindrome (32747874723).

The spelling of 21242450511 in words is "twenty-one billion, two hundred forty-two million, four hundred fifty thousand, five hundred eleven".