21223142543042 has 32 divisors (see below), whose sum is σ = 34852599734400. Its totient is φ = 9612498251520.

The previous prime is 21223142543023. The next prime is 21223142543051. The reversal of 21223142543042 is 24034524132212.

It is a super-2 number, since 2×21223142543042² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21223142542993 and 21223142543011.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42767459 + ... + 43260857.

It is an arithmetic number, because the mean of its divisors is an integer number (1089143741700).

Almost surely, 2^{21223142543042} is an apocalyptic number.

21223142543042 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21223142543042 is a deficient number, since it is larger than the sum of its proper divisors (13629457191358).

21223142543042 is a wasteful number, since it uses less digits than its factorization.

21223142543042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500378.

The product of its (nonzero) digits is 92160, while the sum is 35.

Adding to 21223142543042 its reverse (24034524132212), we get a palindrome (45257666675254).

The spelling of 21223142543042 in words is "twenty-one trillion, two hundred twenty-three billion, one hundred forty-two million, five hundred forty-three thousand, forty-two".