21430424442 has 16 divisors (see below), whose sum is σ = 48983827392. Its totient is φ = 6122978400.

The previous prime is 21430424423. The next prime is 21430424461. The reversal of 21430424442 is 24442403412.

It is an interprime number because it is at equal distance from previous prime (21430424423) and next prime (21430424461).

It is a super-2 number, since 2×21430424442² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255124059 + ... + 255124142.

It is an arithmetic number, because the mean of its divisors is an integer number (3061489212).

Almost surely, 2^21430424442 is an apocalyptic number.

21430424442 is an abundant number, since it is smaller than the sum of its proper divisors (27553402950).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21430424442 is a wasteful number, since it uses less digits than its factorization.

21430424442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510248213.

The product of its (nonzero) digits is 24576, while the sum is 30.

Adding to 21430424442 its reverse (24442403412), we get a palindrome (45872827854).

The spelling of 21430424442 in words is "twenty-one billion, four hundred thirty million, four hundred twenty-four thousand, four hundred forty-two".