29238421561 has 2 divisors, whose sum is σ = 29238421562. Its totient is φ = 29238421560.

The previous prime is 29238421547. The next prime is 29238421631. The reversal of 29238421561 is 16512483292.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21427397161 + 7811024400 = 146381^2 + 88380^2 .

It is a cyclic number.

It is not a de Polignac number, because 29238421561 - 2⁹ = 29238421049 is a prime.

It is not a weakly prime, because it can be changed into another prime (29238421501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14619210780 + 14619210781.

It is an arithmetic number, because the mean of its divisors is an integer number (14619210781).

Almost surely, 2^29238421561 is an apocalyptic number.

It is an amenable number.

29238421561 is a deficient number, since it is larger than the sum of its proper divisors (1).

29238421561 is an equidigital number, since it uses as much as digits as its factorization.

29238421561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 43.

The spelling of 29238421561 in words is "twenty-nine billion, two hundred thirty-eight million, four hundred twenty-one thousand, five hundred sixty-one".