212115511481 has 2 divisors, whose sum is σ = 212115511482. Its totient is φ = 212115511480.

The previous prime is 212115511477. The next prime is 212115511631. The reversal of 212115511481 is 184115511212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 149292595456 + 62822916025 = 386384^2 + 250645^2 .

It is a cyclic number.

It is not a de Polignac number, because 212115511481 - 2² = 212115511477 is a prime.

It is a super-3 number, since 3×212115511481³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (212115511411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106057755740 + 106057755741.

It is an arithmetic number, because the mean of its divisors is an integer number (106057755741).

Almost surely, 2^212115511481 is an apocalyptic number.

It is an amenable number.

212115511481 is a deficient number, since it is larger than the sum of its proper divisors (1).

212115511481 is an equidigital number, since it uses as much as digits as its factorization.

212115511481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3200, while the sum is 32.

The spelling of 212115511481 in words is "two hundred twelve billion, one hundred fifteen million, five hundred eleven thousand, four hundred eighty-one".