15402224421 has 12 divisors (see below), whose sum is σ = 22285182348. Its totient is φ = 10250830464.

The previous prime is 15402224363. The next prime is 15402224447. The reversal of 15402224421 is 12442220451.

It is a happy number.

15402224421 is a `hidden beast` number, since 15 + 4 + 0 + 2 + 224 + 421 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4775501025 + 10626723396 = 69105^2 + 103086^2 .

It is not a de Polignac number, because 15402224421 - 2⁷ = 15402224293 is a prime.

It is a super-2 number, since 2×15402224421² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15402224491) 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, 1437630 + ... + 1448303.

It is an arithmetic number, because the mean of its divisors is an integer number (1857098529).

Almost surely, 2^15402224421 is an apocalyptic number.

It is an amenable number.

15402224421 is a deficient number, since it is larger than the sum of its proper divisors (6882957927).

15402224421 is a wasteful number, since it uses less digits than its factorization.

15402224421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2886532 (or 2886529 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 27.

Adding to 15402224421 its reverse (12442220451), we get a palindrome (27844444872).

The spelling of 15402224421 in words is "fifteen billion, four hundred two million, two hundred twenty-four thousand, four hundred twenty-one".