21022223249 has 2 divisors, whose sum is σ = 21022223250. Its totient is φ = 21022223248.

The previous prime is 21022223111. The next prime is 21022223263. The reversal of 21022223249 is 94232222012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13655091025 + 7367132224 = 116855^2 + 85832^2 .

It is a cyclic number.

It is not a de Polignac number, because 21022223249 - 2¹⁶ = 21022157713 is a prime.

It is a super-2 number, since 2×21022223249² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21022223549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10511111624 + 10511111625.

It is an arithmetic number, because the mean of its divisors is an integer number (10511111625).

Almost surely, 2^21022223249 is an apocalyptic number.

It is an amenable number.

21022223249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21022223249 is an equidigital number, since it uses as much as digits as its factorization.

21022223249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 29.

The spelling of 21022223249 in words is "twenty-one billion, twenty-two million, two hundred twenty-three thousand, two hundred forty-nine".