21052242342 has 48 divisors (see below), whose sum is σ = 46586620080. Its totient is φ = 6869209536.

The previous prime is 21052242329. The next prime is 21052242371. The reversal of 21052242342 is 24324225012.

21052242342 is a `hidden beast` number, since 210 + 5 + 22 + 423 + 4 + 2 = 666.

It is a super-4 number, since 4×21052242342⁴ (a number of 42 digits) contains 4444 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 98208 + ... + 227484.

It is an arithmetic number, because the mean of its divisors is an integer number (970554585).

Almost surely, 2^21052242342 is an apocalyptic number.

21052242342 is an abundant number, since it is smaller than the sum of its proper divisors (25534377738).

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

21052242342 is a wasteful number, since it uses less digits than its factorization.

21052242342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129477 (or 129474 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 27.

Adding to 21052242342 its reverse (24324225012), we get a palindrome (45376467354).

The spelling of 21052242342 in words is "twenty-one billion, fifty-two million, two hundred forty-two thousand, three hundred forty-two".