21203211149 has 2 divisors, whose sum is σ = 21203211150. Its totient is φ = 21203211148.

The previous prime is 21203211109. The next prime is 21203211163. The reversal of 21203211149 is 94111230212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10752238249 + 10450972900 = 103693^2 + 102230^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21203211149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21203211109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601605574 + 10601605575.

It is an arithmetic number, because the mean of its divisors is an integer number (10601605575).

Almost surely, 2^21203211149 is an apocalyptic number.

It is an amenable number.

21203211149 is a deficient number, since it is larger than the sum of its proper divisors (1).

21203211149 is an equidigital number, since it uses as much as digits as its factorization.

21203211149 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 21203211149 in words is "twenty-one billion, two hundred three million, two hundred eleven thousand, one hundred forty-nine".