2154421553 has 2 divisors, whose sum is σ = 2154421554. Its totient is φ = 2154421552.

The previous prime is 2154421541. The next prime is 2154421559. The reversal of 2154421553 is 3551244512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1983544369 + 170877184 = 44537^2 + 13072^2 .

It is a cyclic number.

It is not a de Polignac number, because 2154421553 - 2¹² = 2154417457 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (2154421559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1077210776 + 1077210777.

It is an arithmetic number, because the mean of its divisors is an integer number (1077210777).

Almost surely, 2^2154421553 is an apocalyptic number.

It is an amenable number.

2154421553 is a deficient number, since it is larger than the sum of its proper divisors (1).

2154421553 is an equidigital number, since it uses as much as digits as its factorization.

2154421553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 32.

The square root of 2154421553 is about 46415.7468215260. The cubic root of 2154421553 is about 1291.5470398616.

The spelling of 2154421553 in words is "two billion, one hundred fifty-four million, four hundred twenty-one thousand, five hundred fifty-three".