21030699187 has 2 divisors, whose sum is σ = 21030699188. Its totient is φ = 21030699186.

The previous prime is 21030699149. The next prime is 21030699191. The reversal of 21030699187 is 78199603012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21030699187 - 2²³ = 21022310579 is a prime.

It is not a weakly prime, because it can be changed into another prime (21030699787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515349593 + 10515349594.

It is an arithmetic number, because the mean of its divisors is an integer number (10515349594).

Almost surely, 2^21030699187 is an apocalyptic number.

21030699187 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030699187 is an equidigital number, since it uses as much as digits as its factorization.

21030699187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 46.

The spelling of 21030699187 in words is "twenty-one billion, thirty million, six hundred ninety-nine thousand, one hundred eighty-seven".