21030352442 has 8 divisors (see below), whose sum is σ = 34413304032. Its totient is φ = 9559251100.

The previous prime is 21030352439. The next prime is 21030352451. The reversal of 21030352442 is 24425303012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×21030352442³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477962534 + ... + 477962577.

It is an arithmetic number, because the mean of its divisors is an integer number (4301663004).

Almost surely, 2^21030352442 is an apocalyptic number.

21030352442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21030352442 is a deficient number, since it is larger than the sum of its proper divisors (13382951590).

21030352442 is a wasteful number, since it uses less digits than its factorization.

21030352442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955925124.

The product of its (nonzero) digits is 5760, while the sum is 26.

Adding to 21030352442 its reverse (24425303012), we get a palindrome (45455655454).

The spelling of 21030352442 in words is "twenty-one billion, thirty million, three hundred fifty-two thousand, four hundred forty-two".