1211210000072 has 8 divisors (see below), whose sum is σ = 2271018750150. Its totient is φ = 605605000032.

The previous prime is 1211210000069. The next prime is 1211210000107. The reversal of 1211210000072 is 2700000121121.

It can be written as a sum of positive squares in only one way, i.e., 1154563144036 + 56646856036 = 1074506^2 + 238006^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-4 number, since 4×1211210000072⁴ (a number of 49 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1211210000072.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 75700624997 + ... + 75700625012.

Almost surely, 2^{1211210000072} is an apocalyptic number.

It is an amenable number.

1211210000072 is a deficient number, since it is larger than the sum of its proper divisors (1059808750078).

1211210000072 is a wasteful number, since it uses less digits than its factorization.

1211210000072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151401250015 (or 151401250011 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 17.

Adding to 1211210000072 its reverse (2700000121121), we get a palindrome (3911210121193).

The spelling of 1211210000072 in words is "one trillion, two hundred eleven billion, two hundred ten million, seventy-two", and thus it is an aban number.