21221092621403 has 2 divisors, whose sum is σ = 21221092621404. Its totient is φ = 21221092621402.

The previous prime is 21221092621387. The next prime is 21221092621423. The reversal of 21221092621403 is 30412629012212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21221092621403 - 2⁴ = 21221092621387 is a prime.

It is not a weakly prime, because it can be changed into another prime (21221092621423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10610546310701 + 10610546310702.

It is an arithmetic number, because the mean of its divisors is an integer number (10610546310702).

Almost surely, 2^{21221092621403} is an apocalyptic number.

21221092621403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21221092621403 is an equidigital number, since it uses as much as digits as its factorization.

21221092621403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 35.

The spelling of 21221092621403 in words is "twenty-one trillion, two hundred twenty-one billion, ninety-two million, six hundred twenty-one thousand, four hundred three".