21000203101034 has 4 divisors (see below), whose sum is σ = 31500304651554. Its totient is φ = 10500101550516.

The previous prime is 21000203100979. The next prime is 21000203101091. The reversal of 21000203101034 is 43010130200012.

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

It can be written as a sum of positive squares in only one way, i.e., 17831642899009 + 3168560202025 = 4222753^2 + 1780045^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250050775257 + ... + 5250050775260.

Almost surely, 2^{21000203101034} is an apocalyptic number.

21000203101034 is a deficient number, since it is larger than the sum of its proper divisors (10500101550520).

21000203101034 is a wasteful number, since it uses less digits than its factorization.

21000203101034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500101550519.

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

Adding to 21000203101034 its reverse (43010130200012), we get a palindrome (64010333301046).

The spelling of 21000203101034 in words is "twenty-one trillion, two hundred three million, one hundred one thousand, thirty-four".