21227363747 has 2 divisors, whose sum is σ = 21227363748. Its totient is φ = 21227363746.

The previous prime is 21227363743. The next prime is 21227363761. The reversal of 21227363747 is 74736372212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21227363747 - 2² = 21227363743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21227363698 and 21227363707.

It is not a weakly prime, because it can be changed into another prime (21227363743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10613681873 + 10613681874.

It is an arithmetic number, because the mean of its divisors is an integer number (10613681874).

Almost surely, 2^21227363747 is an apocalyptic number.

21227363747 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227363747 is an equidigital number, since it uses as much as digits as its factorization.

21227363747 is an evil number, because the sum of its binary digits is even.

The product of its digits is 592704, while the sum is 44.

The spelling of 21227363747 in words is "twenty-one billion, two hundred twenty-seven million, three hundred sixty-three thousand, seven hundred forty-seven".