30291921693 has 24 divisors (see below), whose sum is σ = 47770245120. Its totient is φ = 18344309760.

The previous prime is 30291921689. The next prime is 30291921701. The reversal of 30291921693 is 39612919203.

It is not a de Polignac number, because 30291921693 - 2² = 30291921689 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30291921643) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7005 + ... + 246237.

It is an arithmetic number, because the mean of its divisors is an integer number (1990426880).

Almost surely, 2^30291921693 is an apocalyptic number.

30291921693 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

30291921693 is a deficient number, since it is larger than the sum of its proper divisors (17478323427).

30291921693 is a wasteful number, since it uses less digits than its factorization.

30291921693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240529 (or 240526 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The spelling of 30291921693 in words is "thirty billion, two hundred ninety-one million, nine hundred twenty-one thousand, six hundred ninety-three".