21661226432302 has 16 divisors (see below), whose sum is σ = 33392649288240. Its totient is φ = 10532543116032.

The previous prime is 21661226432291. The next prime is 21661226432303. The reversal of 21661226432302 is 20323462216612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21661226432303) 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, 549925123 + ... + 549964510.

It is an arithmetic number, because the mean of its divisors is an integer number (2087040580515).

Almost surely, 2^{21661226432302} is an apocalyptic number.

21661226432302 is a deficient number, since it is larger than the sum of its proper divisors (11731422855938).

21661226432302 is a wasteful number, since it uses less digits than its factorization.

21661226432302 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099889907.

The product of its (nonzero) digits is 248832, while the sum is 40.

Adding to 21661226432302 its reverse (20323462216612), we get a palindrome (41984688648914).

The spelling of 21661226432302 in words is "twenty-one trillion, six hundred sixty-one billion, two hundred twenty-six million, four hundred thirty-two thousand, three hundred two".