21213303142 has 16 divisors (see below), whose sum is σ = 31943592864. Its totient is φ = 10565464000.

The previous prime is 21213303127. The next prime is 21213303143. The reversal of 21213303142 is 24130331212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213303143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3358167 + ... + 3364477.

It is an arithmetic number, because the mean of its divisors is an integer number (1996474554).

Almost surely, 2^21213303142 is an apocalyptic number.

21213303142 is a deficient number, since it is larger than the sum of its proper divisors (10730289722).

21213303142 is a wasteful number, since it uses less digits than its factorization.

21213303142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12575.

The product of its (nonzero) digits is 864, while the sum is 22.

Adding to 21213303142 its reverse (24130331212), we get a palindrome (45343634354).

The spelling of 21213303142 in words is "twenty-one billion, two hundred thirteen million, three hundred three thousand, one hundred forty-two".