21520002231342 has 24 divisors (see below), whose sum is σ = 46626918408720. Its totient is φ = 7173296091360.

The previous prime is 21520002231337. The next prime is 21520002231359. The reversal of 21520002231342 is 24313220002512.

21520002231342 is a `hidden beast` number, since 2 + 1 + 520 + 0 + 0 + 2 + 2 + 3 + 134 + 2 = 666.

It is a super-2 number, since 2×21520002231342² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 439042 + ... + 6575162.

It is an arithmetic number, because the mean of its divisors is an integer number (1942788267030).

Almost surely, 2^{21520002231342} is an apocalyptic number.

21520002231342 is an abundant number, since it is smaller than the sum of its proper divisors (25106916177378).

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

21520002231342 is a wasteful number, since it uses less digits than its factorization.

21520002231342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6330968 (or 6330965 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 21520002231342 its reverse (24313220002512), we get a palindrome (45833222233854).

The spelling of 21520002231342 in words is "twenty-one trillion, five hundred twenty billion, two million, two hundred thirty-one thousand, three hundred forty-two".