21428417146 has 16 divisors (see below), whose sum is σ = 32602690440. Its totient is φ = 10561780800.

The previous prime is 21428417141. The next prime is 21428417201. The reversal of 21428417146 is 64171482412.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 18407705625 + 3020711521 = 135675^2 + 54961^2 .

It is a super-2 number, since 2×21428417146² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21428417099 and 21428417108.

It is not an unprimeable number, because it can be changed into a prime (21428417141) 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, 185361 + ... + 277876.

Almost surely, 2^21428417146 is an apocalyptic number.

21428417146 is a deficient number, since it is larger than the sum of its proper divisors (11174273294).

21428417146 is a wasteful number, since it uses less digits than its factorization.

21428417146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 463569.

The product of its digits is 86016, while the sum is 40.

Adding to 21428417146 its reverse (64171482412), we get a palindrome (85599899558).

The spelling of 21428417146 in words is "twenty-one billion, four hundred twenty-eight million, four hundred seventeen thousand, one hundred forty-six".