21910216441 has 3 divisors (see below), whose sum is σ = 21910364463. Its totient is φ = 21910068420.

The previous prime is 21910216409. The next prime is 21910216463. The reversal of 21910216441 is 14461201912.

The square root of 21910216441 is 148021.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 17749966441 + 4160250000 = 133229^2 + 64500^2 .

It is not a de Polignac number, because 21910216441 - 2⁵ = 21910216409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21910216541) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 74011 + ... + 222031.

It is an arithmetic number, because the mean of its divisors is an integer number (7303454821).

Almost surely, 2^21910216441 is an apocalyptic number.

21910216441 is the 148021-st square number.

21910216441 is the 74011-st centered octagonal number.

It is an amenable number.

21910216441 is a deficient number, since it is larger than the sum of its proper divisors (148022).

21910216441 is an frugal number, since it uses more digits than its factorization.

21910216441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296042 (or 148021 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The spelling of 21910216441 in words is "twenty-one billion, nine hundred ten million, two hundred sixteen thousand, four hundred forty-one".