21162107260642 has 16 divisors (see below), whose sum is σ = 31946083706232. Its totient is φ = 10513415802240.

The previous prime is 21162107260627. The next prime is 21162107260643. The reversal of 21162107260642 is 24606270126112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 19722205658961 + 1439901601681 = 4440969^2 + 1199959^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21162107260595 and 21162107260604.

It is not an unprimeable number, because it can be changed into a prime (21162107260643) 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, 13255798 + ... + 14766190.

Almost surely, 2^{21162107260642} is an apocalyptic number.

21162107260642 is a deficient number, since it is larger than the sum of its proper divisors (10783976445590).

21162107260642 is a wasteful number, since it uses less digits than its factorization.

21162107260642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555173.

The product of its (nonzero) digits is 96768, while the sum is 40.

Adding to 21162107260642 its reverse (24606270126112), we get a palindrome (45768377386754).

The spelling of 21162107260642 in words is "twenty-one trillion, one hundred sixty-two billion, one hundred seven million, two hundred sixty thousand, six hundred forty-two".