72101021512 has 16 divisors (see below), whose sum is σ = 145588601340. Its totient is φ = 33277394496.

The previous prime is 72101021507. The next prime is 72101021519. The reversal of 72101021512 is 21512010127.

It can be written as a sum of positive squares in 2 ways, for example, as 71988109636 + 112911876 = 268306^2 + 10626^2 .

It is a super-2 number, since 2×72101021512² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72101021519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346639423 + ... + 346639630.

Almost surely, 2^72101021512 is an apocalyptic number.

It is an amenable number.

72101021512 is an abundant number, since it is smaller than the sum of its proper divisors (73487579828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72101021512 is a wasteful number, since it uses less digits than its factorization.

72101021512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 693279072 (or 693279068 counting only the distinct ones).

The product of its (nonzero) digits is 280, while the sum is 22.

Adding to 72101021512 its reverse (21512010127), we get a palindrome (93613031639).

The spelling of 72101021512 in words is "seventy-two billion, one hundred one million, twenty-one thousand, five hundred twelve".