1211210612015 has 16 divisors (see below), whose sum is σ = 1501014256896. Its totient is φ = 937288972800.

The previous prime is 1211210611951. The next prime is 1211210612033. The reversal of 1211210612015 is 5102160121121.

It is a happy number.

It is not a de Polignac number, because 1211210612015 - 2⁶ = 1211210611951 is a prime.

It is a super-2 number, since 2×1211210612015² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1414922 + ... + 2103431.

It is an arithmetic number, because the mean of its divisors is an integer number (93813391056).

Almost surely, 2^{1211210612015} is an apocalyptic number.

1211210612015 is a deficient number, since it is larger than the sum of its proper divisors (289803644881).

1211210612015 is a wasteful number, since it uses less digits than its factorization.

1211210612015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3520610.

The product of its (nonzero) digits is 240, while the sum is 23.

Adding to 1211210612015 its reverse (5102160121121), we get a palindrome (6313370733136).

The spelling of 1211210612015 in words is "one trillion, two hundred eleven billion, two hundred ten million, six hundred twelve thousand, fifteen".