21078529151 has 2 divisors, whose sum is σ = 21078529152. Its totient is φ = 21078529150.

The previous prime is 21078529133. The next prime is 21078529163. The reversal of 21078529151 is 15192587012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21078529151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21078529099 and 21078529108.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21078529181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10539264575 + 10539264576.

It is an arithmetic number, because the mean of its divisors is an integer number (10539264576).

Almost surely, 2^21078529151 is an apocalyptic number.

21078529151 is a deficient number, since it is larger than the sum of its proper divisors (1).

21078529151 is an equidigital number, since it uses as much as digits as its factorization.

21078529151 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50400, while the sum is 41.

The spelling of 21078529151 in words is "twenty-one billion, seventy-eight million, five hundred twenty-nine thousand, one hundred fifty-one".