21142065306 has 32 divisors (see below), whose sum is σ = 42373800000. Its totient is φ = 7032430080.

The previous prime is 21142065239. The next prime is 21142065331. The reversal of 21142065306 is 60356024112.

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, 7949805 + ... + 7952463.

It is an arithmetic number, because the mean of its divisors is an integer number (1324181250).

Almost surely, 2^21142065306 is an apocalyptic number.

21142065306 is an abundant number, since it is smaller than the sum of its proper divisors (21231734694).

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

21142065306 is a wasteful number, since it uses less digits than its factorization.

21142065306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4974.

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 21142065306 its reverse (60356024112), we get a palindrome (81498089418).

The spelling of 21142065306 in words is "twenty-one billion, one hundred forty-two million, sixty-five thousand, three hundred six".