30403131021 has 12 divisors (see below), whose sum is σ = 44986747260. Its totient is φ = 19774393920.

The previous prime is 30403130971. The next prime is 30403131043. The reversal of 30403131021 is 12013130403.

30403131021 is a `hidden beast` number, since 304 + 0 + 31 + 310 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 13785342921 + 16617788100 = 117411^2 + 128910^2 .

It is not a de Polignac number, because 30403131021 - 2⁹ = 30403130509 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 30403130985 and 30403131003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30403133021) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41196286 + ... + 41197023.

It is an arithmetic number, because the mean of its divisors is an integer number (3748895605).

Almost surely, 2^30403131021 is an apocalyptic number.

It is an amenable number.

30403131021 is a deficient number, since it is larger than the sum of its proper divisors (14583616239).

30403131021 is a wasteful number, since it uses less digits than its factorization.

30403131021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82393356 (or 82393353 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 30403131021 its reverse (12013130403), we get a palindrome (42416261424).

The spelling of 30403131021 in words is "thirty billion, four hundred three million, one hundred thirty-one thousand, twenty-one".