20553341153421 has 4 divisors (see below), whose sum is σ = 27404454871232. Its totient is φ = 13702227435612.

The previous prime is 20553341153363. The next prime is 20553341153479. The reversal of 20553341153421 is 12435114335502.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (20553341153363) and next prime (20553341153479).

It is not a de Polignac number, because 20553341153421 - 2¹⁷ = 20553341022349 is a prime.

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 20553341153421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20553341133421) 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, 3425556858901 + ... + 3425556858906.

It is an arithmetic number, because the mean of its divisors is an integer number (6851113717808).

Almost surely, 2^{20553341153421} is an apocalyptic number.

It is an amenable number.

20553341153421 is a deficient number, since it is larger than the sum of its proper divisors (6851113717811).

20553341153421 is an equidigital number, since it uses as much as digits as its factorization.

20553341153421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6851113717810.

The product of its (nonzero) digits is 216000, while the sum is 39.

Adding to 20553341153421 its reverse (12435114335502), we get a palindrome (32988455488923).

The spelling of 20553341153421 in words is "twenty trillion, five hundred fifty-three billion, three hundred forty-one million, one hundred fifty-three thousand, four hundred twenty-one".