21003403034 has 4 divisors (see below), whose sum is σ = 31505104554. Its totient is φ = 10501701516.

The previous prime is 21003402983. The next prime is 21003403037. The reversal of 21003403034 is 43030430012.

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., 12837569809 + 8165833225 = 113303^2 + 90365^2 .

It is a super-2 number, since 2×21003403034² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21003402997 and 21003403015.

It is not an unprimeable number, because it can be changed into a prime (21003403037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250850757 + ... + 5250850760.

Almost surely, 2^21003403034 is an apocalyptic number.

21003403034 is a deficient number, since it is larger than the sum of its proper divisors (10501701520).

21003403034 is a wasteful number, since it uses less digits than its factorization.

21003403034 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10501701519.

The product of its (nonzero) digits is 864, while the sum is 20.

Adding to 21003403034 its reverse (43030430012), we get a palindrome (64033833046).

The spelling of 21003403034 in words is "twenty-one billion, three million, four hundred three thousand, thirty-four".