21620045400223 has 2 divisors, whose sum is σ = 21620045400224. Its totient is φ = 21620045400222.

The previous prime is 21620045400197. The next prime is 21620045400241. The reversal of 21620045400223 is 32200454002612.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21620045400223 - 2¹³ = 21620045392031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21620045400263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10810022700111 + 10810022700112.

It is an arithmetic number, because the mean of its divisors is an integer number (10810022700112).

Almost surely, 2^{21620045400223} is an apocalyptic number.

21620045400223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21620045400223 is an equidigital number, since it uses as much as digits as its factorization.

21620045400223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 31.

Adding to 21620045400223 its reverse (32200454002612), we get a palindrome (53820499402835).

The spelling of 21620045400223 in words is "twenty-one trillion, six hundred twenty billion, forty-five million, four hundred thousand, two hundred twenty-three".