21227062949 has 2 divisors, whose sum is σ = 21227062950. Its totient is φ = 21227062948.

The previous prime is 21227062933. The next prime is 21227062993. The reversal of 21227062949 is 94926072212.

It is a happy number.

It is an a-pointer prime, because the next prime (21227062993) can be obtained adding 21227062949 to its sum of digits (44).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20662050049 + 565012900 = 143743^2 + 23770^2 .

It is a cyclic number.

It is not a de Polignac number, because 21227062949 - 2⁴ = 21227062933 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

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, 10613531474 + 10613531475.

It is an arithmetic number, because the mean of its divisors is an integer number (10613531475).

Almost surely, 2^21227062949 is an apocalyptic number.

It is an amenable number.

21227062949 is a deficient number, since it is larger than the sum of its proper divisors (1).

21227062949 is an equidigital number, since it uses as much as digits as its factorization.

21227062949 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 21227062949 in words is "twenty-one billion, two hundred twenty-seven million, sixty-two thousand, nine hundred forty-nine".