1621122253513 has 16 divisors (see below), whose sum is σ = 1858342729600. Its totient is φ = 1385311061376.

The previous prime is 1621122253459. The next prime is 1621122253547. The reversal of 1621122253513 is 3153522211261.

It is a cyclic number.

It is not a de Polignac number, because 1621122253513 - 2²¹ = 1621120156361 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1621122253573) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14781706 + ... + 14890972.

It is an arithmetic number, because the mean of its divisors is an integer number (116146420600).

Almost surely, 2^{1621122253513} is an apocalyptic number.

It is an amenable number.

1621122253513 is a deficient number, since it is larger than the sum of its proper divisors (237220476087).

1621122253513 is a wasteful number, since it uses less digits than its factorization.

1621122253513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115696.

The product of its digits is 21600, while the sum is 34.

Adding to 1621122253513 its reverse (3153522211261), we get a palindrome (4774644464774).

The spelling of 1621122253513 in words is "one trillion, six hundred twenty-one billion, one hundred twenty-two million, two hundred fifty-three thousand, five hundred thirteen".