20021453254401 has 16 divisors (see below), whose sum is σ = 27061657813440. Its totient is φ = 13164451534080.

The previous prime is 20021453254379. The next prime is 20021453254433. The reversal of 20021453254401 is 10445235412002.

It is not a de Polignac number, because 20021453254401 - 2²¹ = 20021451157249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20021453254471) 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, 7473141 + ... + 9792381.

It is an arithmetic number, because the mean of its divisors is an integer number (1691353613340).

Almost surely, 2^{20021453254401} is an apocalyptic number.

It is an amenable number.

20021453254401 is a deficient number, since it is larger than the sum of its proper divisors (7040204559039).

20021453254401 is a wasteful number, since it uses less digits than its factorization.

20021453254401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2358736.

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 20021453254401 its reverse (10445235412002), we get a palindrome (30466688666403).

The spelling of 20021453254401 in words is "twenty trillion, twenty-one billion, four hundred fifty-three million, two hundred fifty-four thousand, four hundred one".