2154421525 has 6 divisors (see below), whose sum is σ = 2671482722. Its totient is φ = 1723537200.

The previous prime is 2154421519. The next prime is 2154421531. The reversal of 2154421525 is 5251244512.

It is an interprime number because it is at equal distance from previous prime (2154421519) and next prime (2154421531).

It can be written as a sum of positive squares in 3 ways, for example, as 34187409 + 2120234116 = 5847^2 + 46046^2 .

It is not a de Polignac number, because 2154421525 - 2¹³ = 2154413333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 43088406 + ... + 43088455.

Almost surely, 2^2154421525 is an apocalyptic number.

2154421525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2154421525 is a deficient number, since it is larger than the sum of its proper divisors (517061197).

2154421525 is an equidigital number, since it uses as much as digits as its factorization.

2154421525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86176871 (or 86176866 counting only the distinct ones).

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

The square root of 2154421525 is about 46415.7465199042. The cubic root of 2154421525 is about 1291.5470342664.

The spelling of 2154421525 in words is "two billion, one hundred fifty-four million, four hundred twenty-one thousand, five hundred twenty-five".