21227736452 has 36 divisors (see below), whose sum is σ = 41523584256. Its totient is φ = 9481361760.

The previous prime is 21227736433. The next prime is 21227736457. The reversal of 21227736452 is 25463772212.

It is not an unprimeable number, because it can be changed into a prime (21227736457) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 485528 + ... + 527439.

It is an arithmetic number, because the mean of its divisors is an integer number (1153432896).

Almost surely, 2^21227736452 is an apocalyptic number.

It is an amenable number.

21227736452 is a deficient number, since it is larger than the sum of its proper divisors (20295847804).

21227736452 is a wasteful number, since it uses less digits than its factorization.

21227736452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1013028 (or 1013013 counting only the distinct ones).

The product of its digits is 282240, while the sum is 41.

The spelling of 21227736452 in words is "twenty-one billion, two hundred twenty-seven million, seven hundred thirty-six thousand, four hundred fifty-two".