1021111402042 has 8 divisors (see below), whose sum is σ = 1541946748500. Its totient is φ = 507129152544.

The previous prime is 1021111402033. The next prime is 1021111402061. The reversal of 1021111402042 is 2402041111201.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 995626791721 + 25484610321 = 997811^2 + 159639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1713273867 + ... + 1713274462.

Almost surely, 2^{1021111402042} is an apocalyptic number.

1021111402042 is a deficient number, since it is larger than the sum of its proper divisors (520835346458).

1021111402042 is a wasteful number, since it uses less digits than its factorization.

1021111402042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3426548480.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 1021111402042 its reverse (2402041111201), we get a palindrome (3423152513243).

It can be divided in two parts, 10211 and 11402042, that added together give a triangular number (11412253 = T₄₇₇₇).

The spelling of 1021111402042 in words is "one trillion, twenty-one billion, one hundred eleven million, four hundred two thousand, forty-two".