21227062993 has 2 divisors, whose sum is σ = 21227062994. Its totient is φ = 21227062992.

The previous prime is 21227062949. The next prime is 21227062999. The reversal of 21227062993 is 39926072212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12157929169 + 9069133824 = 110263^2 + 95232^2 .

It is a cyclic number.

It is not a de Polignac number, because 21227062993 - 2¹³ = 21227054801 is a prime.

It is not a weakly prime, because it can be changed into another prime (21227062999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613531496 + 10613531497.

It is an arithmetic number, because the mean of its divisors is an integer number (10613531497).

Almost surely, 2^21227062993 is an apocalyptic number.

It is an amenable number.

21227062993 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227062993 is an equidigital number, since it uses as much as digits as its factorization.

21227062993 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 21227062993 in words is "twenty-one billion, two hundred twenty-seven million, sixty-two thousand, nine hundred ninety-three".