21301211249 has 2 divisors, whose sum is σ = 21301211250. Its totient is φ = 21301211248.

The previous prime is 21301211179. The next prime is 21301211279. The reversal of 21301211249 is 94211210312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20932302400 + 368908849 = 144680^2 + 19207^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301211249 - 2¹² = 21301207153 is a prime.

It is not a weakly prime, because it can be changed into another prime (21301211279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650605624 + 10650605625.

It is an arithmetic number, because the mean of its divisors is an integer number (10650605625).

Almost surely, 2^21301211249 is an apocalyptic number.

It is an amenable number.

21301211249 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301211249 is an equidigital number, since it uses as much as digits as its factorization.

21301211249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 21301211249 in words is "twenty-one billion, three hundred one million, two hundred eleven thousand, two hundred forty-nine".