21954645241 has 3 divisors (see below), whose sum is σ = 21954793413. Its totient is φ = 21954497070.

The previous prime is 21954645203. The next prime is 21954645263. The reversal of 21954645241 is 14254645912.

The square root of 21954645241 is 148171.

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 is not a de Polignac number, because 21954645241 - 2⁷ = 21954645113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21954645541) 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, 74086 + ... + 222256.

It is an arithmetic number, because the mean of its divisors is an integer number (7318264471).

Almost surely, 2^21954645241 is an apocalyptic number.

21954645241 is the 148171-st square number.

21954645241 is the 74086-th centered octagonal number.

It is an amenable number.

21954645241 is a deficient number, since it is larger than the sum of its proper divisors (148172).

21954645241 is an frugal number, since it uses more digits than its factorization.

21954645241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296342 (or 148171 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The spelling of 21954645241 in words is "twenty-one billion, nine hundred fifty-four million, six hundred forty-five thousand, two hundred forty-one".