21111539342 has 32 divisors (see below), whose sum is σ = 32516588160. Its totient is φ = 10277632800.

The previous prime is 21111539341. The next prime is 21111539347. The reversal of 21111539342 is 24393511112.

It is a junction number, because it is equal to n+sod(n) for n = 21111539299 and 21111539308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111539341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3000833 + ... + 3007859.

It is an arithmetic number, because the mean of its divisors is an integer number (1016143380).

Almost surely, 2^21111539342 is an apocalyptic number.

21111539342 is a deficient number, since it is larger than the sum of its proper divisors (11405048818).

21111539342 is a wasteful number, since it uses less digits than its factorization.

21111539342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7376.

The product of its digits is 6480, while the sum is 32.

The spelling of 21111539342 in words is "twenty-one billion, one hundred eleven million, five hundred thirty-nine thousand, three hundred forty-two".