21363148421 has 6 divisors (see below), whose sum is σ = 21576769266. Its totient is φ = 21151622000.

The previous prime is 21363148369. The next prime is 21363148459. The reversal of 21363148421 is 12484136312.

It can be written as a sum of positive squares in 3 ways, for example, as 12240988321 + 9122160100 = 110639^2 + 95510^2 .

It is a de Polignac number, because none of the positive numbers 2^k-21363148421 is a prime.

It is a super-2 number, since 2×21363148421² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21363148021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1036910 + ... + 1057311.

It is an arithmetic number, because the mean of its divisors is an integer number (3596128211).

Almost surely, 2^21363148421 is an apocalyptic number.

It is an amenable number.

21363148421 is a deficient number, since it is larger than the sum of its proper divisors (213620845).

21363148421 is an equidigital number, since it uses as much as digits as its factorization.

21363148421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2094423 (or 2094322 counting only the distinct ones).

The product of its digits is 27648, while the sum is 35.

The spelling of 21363148421 in words is "twenty-one billion, three hundred sixty-three million, one hundred forty-eight thousand, four hundred twenty-one".