21031340342 has 16 divisors (see below), whose sum is σ = 31959447360. Its totient is φ = 10378300608.

The previous prime is 21031340329. The next prime is 21031340347. The reversal of 21031340342 is 24304313012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21031340347) 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, 377978 + ... + 430034.

It is an arithmetic number, because the mean of its divisors is an integer number (1997465460).

Almost surely, 2^21031340342 is an apocalyptic number.

21031340342 is a deficient number, since it is larger than the sum of its proper divisors (10928107018).

21031340342 is a wasteful number, since it uses less digits than its factorization.

21031340342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54695.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21031340342 its reverse (24304313012), we get a palindrome (45335653354).

The spelling of 21031340342 in words is "twenty-one billion, thirty-one million, three hundred forty thousand, three hundred forty-two".