1621112134027 has 4 divisors (see below), whose sum is σ = 1624022569296. Its totient is φ = 1618201698760.

The previous prime is 1621112134021. The next prime is 1621112134087. The reversal of 1621112134027 is 7204312111261.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1621112134027 - 2¹⁹ = 1621111609739 is a prime.

It is a super-2 number, since 2×1621112134027² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1621112134027.

It is not an unprimeable number, because it can be changed into a prime (1621112134021) 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, 1455216799 + ... + 1455217912.

It is an arithmetic number, because the mean of its divisors is an integer number (406005642324).

Almost surely, 2^{1621112134027} is an apocalyptic number.

1621112134027 is a deficient number, since it is larger than the sum of its proper divisors (2910435269).

1621112134027 is an equidigital number, since it uses as much as digits as its factorization.

1621112134027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2910435268.

The product of its (nonzero) digits is 4032, while the sum is 31.

Adding to 1621112134027 its reverse (7204312111261), we get a palindrome (8825424245288).

The spelling of 1621112134027 in words is "one trillion, six hundred twenty-one billion, one hundred twelve million, one hundred thirty-four thousand, twenty-seven".