21434220434 has 64 divisors (see below), whose sum is σ = 36205678080. Its totient is φ = 9434880000.

The previous prime is 21434220427. The next prime is 21434220461. The reversal of 21434220434 is 43402243412.

It is a super-2 number, since 2×21434220434² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21434220397 and 21434220406.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30576284 + ... + 30576984.

It is an arithmetic number, because the mean of its divisors is an integer number (565713720).

Almost surely, 2^21434220434 is an apocalyptic number.

21434220434 is a deficient number, since it is larger than the sum of its proper divisors (14771457646).

21434220434 is a wasteful number, since it uses less digits than its factorization.

21434220434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1107.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 21434220434 its reverse (43402243412), we get a palindrome (64836463846).

The spelling of 21434220434 in words is "twenty-one billion, four hundred thirty-four million, two hundred twenty thousand, four hundred thirty-four".