15421727434 has 16 divisors (see below), whose sum is σ = 23274374760. Its totient is φ = 7663654080.

The previous prime is 15421727423. The next prime is 15421727437. The reversal of 15421727434 is 43472712451.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 12489180025 + 2932547409 = 111755^2 + 54153^2 .

It is a super-3 number, since 3×15421727434³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (15421727437) 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, 635712 + ... + 659524.

Almost surely, 2^15421727434 is an apocalyptic number.

15421727434 is a deficient number, since it is larger than the sum of its proper divisors (7852647326).

15421727434 is a wasteful number, since it uses less digits than its factorization.

15421727434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25785.

The product of its digits is 188160, while the sum is 40.

The spelling of 15421727434 in words is "fifteen billion, four hundred twenty-one million, seven hundred twenty-seven thousand, four hundred thirty-four".