2145626421 has 8 divisors (see below), whose sum is σ = 2861349984. Its totient is φ = 1430160240.

The previous prime is 2145626419. The next prime is 2145626429. The reversal of 2145626421 is 1246265412.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2145626421 - 2¹ = 2145626419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145626429) 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, 43971 + ... + 78896.

It is an arithmetic number, because the mean of its divisors is an integer number (357668748).

Almost surely, 2^2145626421 is an apocalyptic number.

It is an amenable number.

2145626421 is a deficient number, since it is larger than the sum of its proper divisors (715723563).

2145626421 is a wasteful number, since it uses less digits than its factorization.

2145626421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128691.

The product of its digits is 23040, while the sum is 33.

The square root of 2145626421 is about 46320.9069535561. The cubic root of 2145626421 is about 1289.7871212931.

The spelling of 2145626421 in words is "two billion, one hundred forty-five million, six hundred twenty-six thousand, four hundred twenty-one".