19129021 has 2 divisors, whose sum is σ = 19129022. Its totient is φ = 19129020.

The previous prime is 19129007. The next prime is 19129027. The reversal of 19129021 is 12092191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18619225 + 509796 = 4315^2 + 714^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19129021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (19129027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9564510 + 9564511.

It is an arithmetic number, because the mean of its divisors is an integer number (9564511).

Almost surely, 2^19129021 is an apocalyptic number.

It is an amenable number.

19129021 is a deficient number, since it is larger than the sum of its proper divisors (1).

19129021 is an equidigital number, since it uses as much as digits as its factorization.

19129021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 19129021 is about 4373.6736275127. The cubic root of 19129021 is about 267.4428025727.

The spelling of 19129021 in words is "nineteen million, one hundred twenty-nine thousand, twenty-one".