21000102442 has 8 divisors (see below), whose sum is σ = 34363804032. Its totient is φ = 9545501100.

The previous prime is 21000102433. The next prime is 21000102457. The reversal of 21000102442 is 24420100012.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 477275034 + ... + 477275077.

It is an arithmetic number, because the mean of its divisors is an integer number (4295475504).

Almost surely, 2^21000102442 is an apocalyptic number.

21000102442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21000102442 is a deficient number, since it is larger than the sum of its proper divisors (13363701590).

21000102442 is a wasteful number, since it uses less digits than its factorization.

21000102442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 954550124.

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 21000102442 its reverse (24420100012), we get a palindrome (45420202454).

The spelling of 21000102442 in words is "twenty-one billion, one hundred two thousand, four hundred forty-two".