20101405453421 has 4 divisors (see below), whose sum is σ = 20101458374844. Its totient is φ = 20101352532000.

The previous prime is 20101405453397. The next prime is 20101405453429. The reversal of 20101405453421 is 12435450410102.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9956479741321 + 10144925712100 = 3155389^2 + 3185110^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101405453421 - 2¹⁰ = 20101405452397 is a prime.

It is a super-5 number, since 5×20101405453421⁵ (a number of 68 digits) contains 55555 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20101405453429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25886810 + ... + 26652011.

It is an arithmetic number, because the mean of its divisors is an integer number (5025364593711).

Almost surely, 2^{20101405453421} is an apocalyptic number.

It is an amenable number.

20101405453421 is a deficient number, since it is larger than the sum of its proper divisors (52921423).

20101405453421 is an equidigital number, since it uses as much as digits as its factorization.

20101405453421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52921422.

The product of its (nonzero) digits is 19200, while the sum is 32.

Adding to 20101405453421 its reverse (12435450410102), we get a palindrome (32536855863523).

The spelling of 20101405453421 in words is "twenty trillion, one hundred one billion, four hundred five million, four hundred fifty-three thousand, four hundred twenty-one".