1721427454420 has 24 divisors (see below), whose sum is σ = 3620096411400. Its totient is φ = 687599789952.

The previous prime is 1721427454391. The next prime is 1721427454429. The reversal of 1721427454420 is 244547241271.

It can be written as a sum of positive squares in 4 ways, for example, as 19388891536 + 1702038562884 = 139244^2 + 1304622^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1721427454429) 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, 60684955 + ... + 60713314.

It is an arithmetic number, because the mean of its divisors is an integer number (150837350475).

Almost surely, 2^{1721427454420} is an apocalyptic number.

1721427454420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1721427454420 is an abundant number, since it is smaller than the sum of its proper divisors (1898668956980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1721427454420 is a wasteful number, since it uses less digits than its factorization.

1721427454420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121398987 (or 121398985 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 43.

The spelling of 1721427454420 in words is "one trillion, seven hundred twenty-one billion, four hundred twenty-seven million, four hundred fifty-four thousand, four hundred twenty".