30721265061 has 8 divisors (see below), whose sum is σ = 40981359840. Its totient is φ = 20471006832.

The previous prime is 30721265051. The next prime is 30721265077. The reversal of 30721265061 is 16056212703.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30721265061 - 2⁶ = 30721264997 is a prime.

It is a super-2 number, since 2×30721265061² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30721265021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2451846 + ... + 2464343.

It is an arithmetic number, because the mean of its divisors is an integer number (5122669980).

Almost surely, 2^30721265061 is an apocalyptic number.

It is an amenable number.

30721265061 is a deficient number, since it is larger than the sum of its proper divisors (10260094779).

30721265061 is a wasteful number, since it uses less digits than its factorization.

30721265061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4918275.

The product of its (nonzero) digits is 15120, while the sum is 33.

Adding to 30721265061 its reverse (16056212703), we get a palindrome (46777477764).

It can be divided in two parts, 307212 and 65061, that added together give a palindrome (372273).

The spelling of 30721265061 in words is "thirty billion, seven hundred twenty-one million, two hundred sixty-five thousand, sixty-one".