21367633749541 has 2 divisors, whose sum is σ = 21367633749542. Its totient is φ = 21367633749540.

The previous prime is 21367633749467. The next prime is 21367633749547. The reversal of 21367633749541 is 14594733676312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11985817898916 + 9381815850625 = 3462054^2 + 3062975^2 .

It is a cyclic number.

It is not a de Polignac number, because 21367633749541 - 2¹⁵ = 21367633716773 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21367633749541.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21367633749547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10683816874770 + 10683816874771.

It is an arithmetic number, because the mean of its divisors is an integer number (10683816874771).

Almost surely, 2^{21367633749541} is an apocalyptic number.

It is an amenable number.

21367633749541 is a deficient number, since it is larger than the sum of its proper divisors (1).

21367633749541 is an equidigital number, since it uses as much as digits as its factorization.

21367633749541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68584320, while the sum is 61.

The spelling of 21367633749541 in words is "twenty-one trillion, three hundred sixty-seven billion, six hundred thirty-three million, seven hundred forty-nine thousand, five hundred forty-one".