21355342774660 has 12 divisors (see below), whose sum is σ = 44846219826828. Its totient is φ = 8542137109856.

The previous prime is 21355342774627. The next prime is 21355342774663. The reversal of 21355342774660 is 6647724355312.

It can be written as a sum of positive squares in 2 ways, for example, as 8125886152836 + 13229456621824 = 2850594^2 + 3637232^2 .

It is not an unprimeable number, because it can be changed into a prime (21355342774663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 533883569347 + ... + 533883569386.

It is an arithmetic number, because the mean of its divisors is an integer number (3737184985569).

Almost surely, 2^{21355342774660} is an apocalyptic number.

21355342774660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21355342774660 is an abundant number, since it is smaller than the sum of its proper divisors (23490877052168).

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

21355342774660 is a wasteful number, since it uses less digits than its factorization.

21355342774660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1067767138742 (or 1067767138740 counting only the distinct ones).

The product of its (nonzero) digits is 25401600, while the sum is 55.

It can be divided in two parts, 2135534 and 2774660, that added together give a palindrome (4910194).

The spelling of 21355342774660 in words is "twenty-one trillion, three hundred fifty-five billion, three hundred forty-two million, seven hundred seventy-four thousand, six hundred sixty".