30527780021 has 2 divisors, whose sum is σ = 30527780022. Its totient is φ = 30527780020.

The previous prime is 30527780011. The next prime is 30527780027. The reversal of 30527780021 is 12008772503.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21459027121 + 9068752900 = 146489^2 + 95230^2 .

It is a cyclic number.

It is not a de Polignac number, because 30527780021 - 2²² = 30523585717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30527780027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15263890010 + 15263890011.

It is an arithmetic number, because the mean of its divisors is an integer number (15263890011).

Almost surely, 2^30527780021 is an apocalyptic number.

It is an amenable number.

30527780021 is a deficient number, since it is larger than the sum of its proper divisors (1).

30527780021 is an equidigital number, since it uses as much as digits as its factorization.

30527780021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23520, while the sum is 35.

The spelling of 30527780021 in words is "thirty billion, five hundred twenty-seven million, seven hundred eighty thousand, twenty-one".