21948473814629 has 2 divisors, whose sum is σ = 21948473814630. Its totient is φ = 21948473814628.

The previous prime is 21948473814557. The next prime is 21948473814697. The reversal of 21948473814629 is 92641837484912.

It is an a-pointer prime, because the next prime (21948473814697) can be obtained adding 21948473814629 to its sum of digits (68).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21446374026529 + 502099788100 = 4631023^2 + 708590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21948473814629 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 (21948473814329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10974236907314 + 10974236907315.

It is an arithmetic number, because the mean of its divisors is an integer number (10974236907315).

Almost surely, 2^{21948473814629} is an apocalyptic number.

It is an amenable number.

21948473814629 is a deficient number, since it is larger than the sum of its proper divisors (1).

21948473814629 is an equidigital number, since it uses as much as digits as its factorization.

21948473814629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 167215104, while the sum is 68.

The spelling of 21948473814629 in words is "twenty-one trillion, nine hundred forty-eight billion, four hundred seventy-three million, eight hundred fourteen thousand, six hundred twenty-nine".