20045002155421 has 8 divisors (see below), whose sum is σ = 20298886025600. Its totient is φ = 19791122027040.

The previous prime is 20045002155419. The next prime is 20045002155427. The reversal of 20045002155421 is 12455120054002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20045002155421 - 2¹ = 20045002155419 is a prime.

It is a super-2 number, since 2×20045002155421² (a number of 27 digits) contains 22 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 (20045002155427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10767865 + ... + 12491473.

It is an arithmetic number, because the mean of its divisors is an integer number (2537360753200).

Almost surely, 2^{20045002155421} is an apocalyptic number.

It is an amenable number.

20045002155421 is a deficient number, since it is larger than the sum of its proper divisors (253883870179).

20045002155421 is a wasteful number, since it uses less digits than its factorization.

20045002155421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1870899.

The product of its (nonzero) digits is 16000, while the sum is 31.

The spelling of 20045002155421 in words is "twenty trillion, forty-five billion, two million, one hundred fifty-five thousand, four hundred twenty-one".