21102201247 has 2 divisors, whose sum is σ = 21102201248. Its totient is φ = 21102201246.

The previous prime is 21102201233. The next prime is 21102201251. The reversal of 21102201247 is 74210220112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21102201247 - 2³¹ = 18954717599 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21102201217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10551100623 + 10551100624.

It is an arithmetic number, because the mean of its divisors is an integer number (10551100624).

Almost surely, 2^21102201247 is an apocalyptic number.

21102201247 is a deficient number, since it is larger than the sum of its proper divisors (1).

21102201247 is an equidigital number, since it uses as much as digits as its factorization.

21102201247 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 22.

Adding to 21102201247 its reverse (74210220112), we get a palindrome (95312421359).

The spelling of 21102201247 in words is "twenty-one billion, one hundred two million, two hundred one thousand, two hundred forty-seven".