21001203134 has 4 divisors (see below), whose sum is σ = 31501804704. Its totient is φ = 10500601566.

The previous prime is 21001203109. The next prime is 21001203149. The reversal of 21001203134 is 43130210012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250300782 + ... + 5250300785.

It is an arithmetic number, because the mean of its divisors is an integer number (7875451176).

Almost surely, 2^21001203134 is an apocalyptic number.

21001203134 is a deficient number, since it is larger than the sum of its proper divisors (10500601570).

21001203134 is a wasteful number, since it uses less digits than its factorization.

21001203134 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10500601569.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21001203134 its reverse (43130210012), we get a palindrome (64131413146).

The spelling of 21001203134 in words is "twenty-one billion, one million, two hundred three thousand, one hundred thirty-four".