21641727141272 has 64 divisors (see below), whose sum is σ = 49908047019840. Its totient is φ = 8586330624000.

The previous prime is 21641727141197. The next prime is 21641727141277. The reversal of 21641727141272 is 27214172714612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21641727141277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 186277229 + ... + 186393372.

It is an arithmetic number, because the mean of its divisors is an integer number (779813234685).

Almost surely, 2^{21641727141272} is an apocalyptic number.

It is an amenable number.

21641727141272 is an abundant number, since it is smaller than the sum of its proper divisors (28266319878568).

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

21641727141272 is a wasteful number, since it uses less digits than its factorization.

21641727141272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 372670692 (or 372670688 counting only the distinct ones).

The product of its digits is 526848, while the sum is 47.

Adding to 21641727141272 its reverse (27214172714612), we get a palindrome (48855899855884).

The spelling of 21641727141272 in words is "twenty-one trillion, six hundred forty-one billion, seven hundred twenty-seven million, one hundred forty-one thousand, two hundred seventy-two".