21480922973 has 2 divisors, whose sum is σ = 21480922974. Its totient is φ = 21480922972.

The previous prime is 21480922913. The next prime is 21480922993. The reversal of 21480922973 is 37922908412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12965693689 + 8515229284 = 113867^2 + 92278^2 .

It is a cyclic number.

It is not a de Polignac number, because 21480922973 - 2¹⁰ = 21480921949 is a prime.

It is a super-2 number, since 2×21480922973² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21480922913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740461486 + 10740461487.

It is an arithmetic number, because the mean of its divisors is an integer number (10740461487).

Almost surely, 2^21480922973 is an apocalyptic number.

It is an amenable number.

21480922973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480922973 is an equidigital number, since it uses as much as digits as its factorization.

21480922973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 21480922973 in words is "twenty-one billion, four hundred eighty million, nine hundred twenty-two thousand, nine hundred seventy-three".