1621112134015 has 32 divisors (see below), whose sum is σ = 2247186037824. Its totient is φ = 1109555005440.

The previous prime is 1621112134013. The next prime is 1621112134021. The reversal of 1621112134015 is 5104312111261.

It is a happy number.

It is not a de Polignac number, because 1621112134015 - 2¹ = 1621112134013 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621112134013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14039497 + ... + 14154493.

It is an arithmetic number, because the mean of its divisors is an integer number (70224563682).

Almost surely, 2^{1621112134015} is an apocalyptic number.

1621112134015 is a deficient number, since it is larger than the sum of its proper divisors (626073903809).

1621112134015 is a wasteful number, since it uses less digits than its factorization.

1621112134015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130107.

The product of its (nonzero) digits is 1440, while the sum is 28.

Adding to 1621112134015 its reverse (5104312111261), we get a palindrome (6725424245276).

The spelling of 1621112134015 in words is "one trillion, six hundred twenty-one billion, one hundred twelve million, one hundred thirty-four thousand, fifteen".