21051000034 has 4 divisors (see below), whose sum is σ = 31576500054. Its totient is φ = 10525500016.

The previous prime is 21051000029. The next prime is 21051000059. The reversal of 21051000034 is 43000015012.

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., 20812390225 + 238609809 = 144265^2 + 15447^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21050999981 and 21051000017.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262750007 + ... + 5262750010.

Almost surely, 2^21051000034 is an apocalyptic number.

21051000034 is a deficient number, since it is larger than the sum of its proper divisors (10525500020).

21051000034 is a wasteful number, since it uses less digits than its factorization.

21051000034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525500019.

The product of its (nonzero) digits is 120, while the sum is 16.

Adding to 21051000034 its reverse (43000015012), we get a palindrome (64051015046).

The spelling of 21051000034 in words is "twenty-one billion, fifty-one million, thirty-four", and thus it is an aban number.