21203031342 has 16 divisors (see below), whose sum is σ = 44637960960. Its totient is φ = 6695694072.

The previous prime is 21203031341. The next prime is 21203031383. The reversal of 21203031342 is 24313030212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203031341) 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, 92995638 + ... + 92995865.

It is an arithmetic number, because the mean of its divisors is an integer number (2789872560).

Almost surely, 2^21203031342 is an apocalyptic number.

21203031342 is an abundant number, since it is smaller than the sum of its proper divisors (23434929618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21203031342 is a wasteful number, since it uses less digits than its factorization.

21203031342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185991527.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21203031342 its reverse (24313030212), we get a palindrome (45516061554).

The spelling of 21203031342 in words is "twenty-one billion, two hundred three million, thirty-one thousand, three hundred forty-two".