21031072250042 has 16 divisors (see below), whose sum is σ = 32937947134272. Its totient is φ = 10052305068960.

The previous prime is 21031072250029. The next prime is 21031072250053. The reversal of 21031072250042 is 24005227013012.

It is a junction number, because it is equal to n+sod(n) for n = 21031072249987 and 21031072250014.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 137055059 + ... + 137208422.

It is an arithmetic number, because the mean of its divisors is an integer number (2058621695892).

Almost surely, 2^{21031072250042} is an apocalyptic number.

21031072250042 is a deficient number, since it is larger than the sum of its proper divisors (11906874884230).

21031072250042 is a wasteful number, since it uses less digits than its factorization.

21031072250042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274265173.

The product of its (nonzero) digits is 6720, while the sum is 29.

Adding to 21031072250042 its reverse (24005227013012), we get a palindrome (45036299263054).

The spelling of 21031072250042 in words is "twenty-one trillion, thirty-one billion, seventy-two million, two hundred fifty thousand, forty-two".