21121303142 has 32 divisors (see below), whose sum is σ = 32967950400. Its totient is φ = 10136448000.

The previous prime is 21121303117. The next prime is 21121303169. The reversal of 21121303142 is 24130312112.

It is a super-2 number, since 2×21121303142² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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, 11726642 + ... + 11728442.

It is an arithmetic number, because the mean of its divisors is an integer number (1030248450).

Almost surely, 2^21121303142 is an apocalyptic number.

21121303142 is a deficient number, since it is larger than the sum of its proper divisors (11846647258).

21121303142 is a wasteful number, since it uses less digits than its factorization.

21121303142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2912.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21121303142 its reverse (24130312112), we get a palindrome (45251615254).

The spelling of 21121303142 in words is "twenty-one billion, one hundred twenty-one million, three hundred three thousand, one hundred forty-two".