11012121601621 has 16 divisors (see below), whose sum is σ = 12727087701120. Its totient is φ = 9332613607680.

The previous prime is 11012121601603. The next prime is 11012121601727. The reversal of 11012121601621 is 12610612121011.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11012121601621 - 2²⁷ = 11011987383893 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 (11012121601121) 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, 20958006 + ... + 21477016.

It is an arithmetic number, because the mean of its divisors is an integer number (795442981320).

Almost surely, 2^{11012121601621} is an apocalyptic number.

It is an amenable number.

11012121601621 is a deficient number, since it is larger than the sum of its proper divisors (1714966099499).

11012121601621 is an equidigital number, since it uses as much as digits as its factorization.

11012121601621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553164.

The product of its (nonzero) digits is 288, while the sum is 25.

Adding to 11012121601621 its reverse (12610612121011), we get a palindrome (23622733722632).

The spelling of 11012121601621 in words is "eleven trillion, twelve billion, one hundred twenty-one million, six hundred one thousand, six hundred twenty-one".