2145512421 has 32 divisors (see below), whose sum is σ = 3624405120. Its totient is φ = 1242646272.

The previous prime is 2145512419. The next prime is 2145512429. The reversal of 2145512421 is 1242155412.

It is a happy number.

2145512421 is a `hidden beast` number, since 2 + 145 + 512 + 4 + 2 + 1 = 666.

It is not a de Polignac number, because 2145512421 - 2¹ = 2145512419 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145512429) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 173815 + ... + 185748.

It is an arithmetic number, because the mean of its divisors is an integer number (113262660).

Almost surely, 2^2145512421 is an apocalyptic number.

It is an amenable number.

2145512421 is a deficient number, since it is larger than the sum of its proper divisors (1478892699).

2145512421 is a wasteful number, since it uses less digits than its factorization.

2145512421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359602 (or 359596 counting only the distinct ones).

The product of its digits is 3200, while the sum is 27.

The square root of 2145512421 is about 46319.6763913566. The cubic root of 2145512421 is about 1289.7642781839.

Adding to 2145512421 its reverse (1242155412), we get a palindrome (3387667833).

The spelling of 2145512421 in words is "two billion, one hundred forty-five million, five hundred twelve thousand, four hundred twenty-one".