21454138242 has 24 divisors (see below), whose sum is σ = 46498676016. Its totient is φ = 7149116376.

The previous prime is 21454138241. The next prime is 21454138243. The reversal of 21454138242 is 24283145412.

21454138242 is a `hidden beast` number, since 214 + 5 + 413 + 8 + 24 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (21454138241) and next prime (21454138243).

It is a junction number, because it is equal to n+sod(n) for n = 21454138197 and 21454138206.

It is not an unprimeable number, because it can be changed into a prime (21454138241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 129628 + ... + 244359.

It is an arithmetic number, because the mean of its divisors is an integer number (1937444834).

Almost surely, 2^21454138242 is an apocalyptic number.

21454138242 is an abundant number, since it is smaller than the sum of its proper divisors (25044537774).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21454138242 is a wasteful number, since it uses less digits than its factorization.

21454138242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377182 (or 377179 counting only the distinct ones).

The product of its digits is 61440, while the sum is 36.

The spelling of 21454138242 in words is "twenty-one billion, four hundred fifty-four million, one hundred thirty-eight thousand, two hundred forty-two".