21450014042 has 4 divisors (see below), whose sum is σ = 32175021066. Its totient is φ = 10725007020.

The previous prime is 21450014041. The next prime is 21450014051. The reversal of 21450014042 is 24041005412.

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

It can be written as a sum of positive squares in only one way, i.e., 12717298441 + 8732715601 = 112771^2 + 93449^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21450013999 and 21450014017.

It is not an unprimeable number, because it can be changed into a prime (21450014041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5362503509 + ... + 5362503512.

Almost surely, 2^21450014042 is an apocalyptic number.

21450014042 is a deficient number, since it is larger than the sum of its proper divisors (10725007024).

21450014042 is a wasteful number, since it uses less digits than its factorization.

21450014042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10725007023.

The product of its (nonzero) digits is 1280, while the sum is 23.

Adding to 21450014042 its reverse (24041005412), we get a palindrome (45491019454).

The spelling of 21450014042 in words is "twenty-one billion, four hundred fifty million, fourteen thousand, forty-two".