21472264742861 has 2 divisors, whose sum is σ = 21472264742862. Its totient is φ = 21472264742860.

The previous prime is 21472264742849. The next prime is 21472264742899. The reversal of 21472264742861 is 16824746227412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18660723877636 + 2811540865225 = 4319806^2 + 1676765^2 .

It is a cyclic number.

It is not a de Polignac number, because 21472264742861 - 2¹⁸ = 21472264480717 is a prime.

It is a super-2 number, since 2×21472264742861² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21472264742797 and 21472264742806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21472264742801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736132371430 + 10736132371431.

It is an arithmetic number, because the mean of its divisors is an integer number (10736132371431).

Almost surely, 2^{21472264742861} is an apocalyptic number.

It is an amenable number.

21472264742861 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472264742861 is an equidigital number, since it uses as much as digits as its factorization.

21472264742861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14450688, while the sum is 56.

The spelling of 21472264742861 in words is "twenty-one trillion, four hundred seventy-two billion, two hundred sixty-four million, seven hundred forty-two thousand, eight hundred sixty-one".