21131130311442 has 96 divisors (see below), whose sum is σ = 47035518566400. Its totient is φ = 6853441795200.

The previous prime is 21131130311399. The next prime is 21131130311513. The reversal of 21131130311442 is 24411303113112.

21131130311442 is a `hidden beast` number, since 2 + 1 + 1 + 311 + 30 + 311 + 4 + 4 + 2 = 666.

It is a super-2 number, since 2×21131130311442² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 290621692 + ... + 290694392.

It is an arithmetic number, because the mean of its divisors is an integer number (489953318400).

Almost surely, 2^{21131130311442} is an apocalyptic number.

21131130311442 is an abundant number, since it is smaller than the sum of its proper divisors (25904388254958).

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

21131130311442 is a wasteful number, since it uses less digits than its factorization.

21131130311442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75288 (or 75285 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

Adding to 21131130311442 its reverse (24411303113112), we get a palindrome (45542433424554).

The spelling of 21131130311442 in words is "twenty-one trillion, one hundred thirty-one billion, one hundred thirty million, three hundred eleven thousand, four hundred forty-two".