21001444102 has 8 divisors (see below), whose sum is σ = 31503170016. Its totient is φ = 10500387432.

The previous prime is 21001444099. The next prime is 21001444103. The reversal of 21001444102 is 20144410012.

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

It is a self number, because there is not a number n which added to its sum of digits gives 21001444102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001444103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79678 + ... + 219889.

It is an arithmetic number, because the mean of its divisors is an integer number (3937896252).

Almost surely, 2^21001444102 is an apocalyptic number.

21001444102 is a deficient number, since it is larger than the sum of its proper divisors (10501725914).

21001444102 is a wasteful number, since it uses less digits than its factorization.

21001444102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334622.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21001444102 its reverse (20144410012), we get a palindrome (41145854114).

The spelling of 21001444102 in words is "twenty-one billion, one million, four hundred forty-four thousand, one hundred two".