21065100342 has 64 divisors (see below), whose sum is σ = 49515701760. Its totient is φ = 5889945600.

The previous prime is 21065100337. The next prime is 21065100403. The reversal of 21065100342 is 24300156012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3841959 + ... + 3847437.

It is an arithmetic number, because the mean of its divisors is an integer number (773682840).

Almost surely, 2^21065100342 is an apocalyptic number.

21065100342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21065100342 is an abundant number, since it is smaller than the sum of its proper divisors (28450601418).

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

21065100342 is a wasteful number, since it uses less digits than its factorization.

21065100342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9989.

The product of its (nonzero) digits is 1440, while the sum is 24.

Adding to 21065100342 its reverse (24300156012), we get a palindrome (45365256354).

The spelling of 21065100342 in words is "twenty-one billion, sixty-five million, one hundred thousand, three hundred forty-two".