21530446371042 has 32 divisors (see below), whose sum is σ = 49235542646784. Its totient is φ = 6148669381200.

The previous prime is 21530446371019. The next prime is 21530446371053. The reversal of 21530446371042 is 24017364403512.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 21530446370985 and 21530446371003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120189634 + ... + 120368637.

It is an arithmetic number, because the mean of its divisors is an integer number (1538610707712).

Almost surely, 2^{21530446371042} is an apocalyptic number.

21530446371042 is an abundant number, since it is smaller than the sum of its proper divisors (27705096275742).

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

21530446371042 is a wasteful number, since it uses less digits than its factorization.

21530446371042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240560414.

The product of its (nonzero) digits is 483840, while the sum is 42.

The spelling of 21530446371042 in words is "twenty-one trillion, five hundred thirty billion, four hundred forty-six million, three hundred seventy-one thousand, forty-two".