2315621421 has 12 divisors (see below), whose sum is σ = 3345767100. Its totient is φ = 1543295040.

The previous prime is 2315621419. The next prime is 2315621437. The reversal of 2315621421 is 1241265132.

2315621421 is a `hidden beast` number, since 2 + 3 + 15 + 621 + 4 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2235965796 + 79655625 = 47286^2 + 8925^2 .

It is not a de Polignac number, because 2315621421 - 2¹ = 2315621419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2315621471) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3696 + ... + 68153.

It is an arithmetic number, because the mean of its divisors is an integer number (278813925).

Almost surely, 2^2315621421 is an apocalyptic number.

It is an amenable number.

2315621421 is a deficient number, since it is larger than the sum of its proper divisors (1030145679).

2315621421 is a wasteful number, since it uses less digits than its factorization.

2315621421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75436 (or 75433 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2315621421 is about 48120.9041997342. The cubic root of 2315621421 is about 1322.9878410313.

Adding to 2315621421 its reverse (1241265132), we get a palindrome (3556886553).

The spelling of 2315621421 in words is "two billion, three hundred fifteen million, six hundred twenty-one thousand, four hundred twenty-one".