21480874381 has 2 divisors, whose sum is σ = 21480874382. Its totient is φ = 21480874380.

The previous prime is 21480874367. The next prime is 21480874409. The reversal of 21480874381 is 18347808412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12980956356 + 8499918025 = 113934^2 + 92195^2 .

It is a cyclic number.

It is not a de Polignac number, because 21480874381 - 2¹⁷ = 21480743309 is a prime.

It is a super-2 number, since 2×21480874381² (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 (21480874301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10740437190 + 10740437191.

It is an arithmetic number, because the mean of its divisors is an integer number (10740437191).

Almost surely, 2^21480874381 is an apocalyptic number.

It is an amenable number.

21480874381 is a deficient number, since it is larger than the sum of its proper divisors (1).

21480874381 is an equidigital number, since it uses as much as digits as its factorization.

21480874381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 344064, while the sum is 46.

The spelling of 21480874381 in words is "twenty-one billion, four hundred eighty million, eight hundred seventy-four thousand, three hundred eighty-one".