21305166342 has 32 divisors (see below), whose sum is σ = 43620541440. Its totient is φ = 6935029920.

The previous prime is 21305166293. The next prime is 21305166353. The reversal of 21305166342 is 24366150312.

It is a super-2 number, since 2×21305166342² (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, 158518 + ... + 260265.

It is an arithmetic number, because the mean of its divisors is an integer number (1363141920).

Almost surely, 2^21305166342 is an apocalyptic number.

21305166342 is an abundant number, since it is smaller than the sum of its proper divisors (22315375098).

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

21305166342 is a wasteful number, since it uses less digits than its factorization.

21305166342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418988.

The product of its (nonzero) digits is 25920, while the sum is 33.

The spelling of 21305166342 in words is "twenty-one billion, three hundred five million, one hundred sixty-six thousand, three hundred forty-two".