21222741541 has 2 divisors, whose sum is σ = 21222741542. Its totient is φ = 21222741540.

The previous prime is 21222741511. The next prime is 21222741601. The reversal of 21222741541 is 14514722212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19118592900 + 2104148641 = 138270^2 + 45871^2 .

It is a cyclic number.

It is not a de Polignac number, because 21222741541 - 2⁵ = 21222741509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21222741511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611370770 + 10611370771.

It is an arithmetic number, because the mean of its divisors is an integer number (10611370771).

Almost surely, 2^21222741541 is an apocalyptic number.

It is an amenable number.

21222741541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21222741541 is an equidigital number, since it uses as much as digits as its factorization.

21222741541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8960, while the sum is 31.

The spelling of 21222741541 in words is "twenty-one billion, two hundred twenty-two million, seven hundred forty-one thousand, five hundred forty-one".