2154004621 has 4 divisors (see below), whose sum is σ = 2154138012. Its totient is φ = 2153871232.

The previous prime is 2154004613. The next prime is 2154004631. The reversal of 2154004621 is 1264004512.

It is a happy number.

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 1956292900 + 197711721 = 44230^2 + 14061^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154004621 - 2³ = 2154004613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2154004631) 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, 38500 + ... + 76093.

It is an arithmetic number, because the mean of its divisors is an integer number (538534503).

Almost surely, 2^2154004621 is an apocalyptic number.

It is an amenable number.

2154004621 is a deficient number, since it is larger than the sum of its proper divisors (133391).

2154004621 is a wasteful number, since it uses less digits than its factorization.

2154004621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133390.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2154004621 is about 46411.2553266985. The cubic root of 2154004621 is about 1291.4637194254.

The spelling of 2154004621 in words is "two billion, one hundred fifty-four million, four thousand, six hundred twenty-one".