21003031234 has 4 divisors (see below), whose sum is σ = 31504546854. Its totient is φ = 10501515616.

The previous prime is 21003031219. The next prime is 21003031289. The reversal of 21003031234 is 43213030012.

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., 20951694009 + 51337225 = 144747^2 + 7165^2 .

It is a super-2 number, since 2×21003031234² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5250757807 + ... + 5250757810.

Almost surely, 2^21003031234 is an apocalyptic number.

21003031234 is a deficient number, since it is larger than the sum of its proper divisors (10501515620).

21003031234 is a wasteful number, since it uses less digits than its factorization.

21003031234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10501515619.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21003031234 its reverse (43213030012), we get a palindrome (64216061246).

The spelling of 21003031234 in words is "twenty-one billion, three million, thirty-one thousand, two hundred thirty-four".