21014021234 has 4 divisors (see below), whose sum is σ = 31521031854. Its totient is φ = 10507010616.

The previous prime is 21014021219. The next prime is 21014021297. The reversal of 21014021234 is 43212041012.

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., 14190765625 + 6823255609 = 119125^2 + 82603^2 .

It is a super-3 number, since 3×21014021234³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253505307 + ... + 5253505310.

Almost surely, 2^21014021234 is an apocalyptic number.

21014021234 is a deficient number, since it is larger than the sum of its proper divisors (10507010620).

21014021234 is a wasteful number, since it uses less digits than its factorization.

21014021234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10507010619.

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21014021234 its reverse (43212041012), we get a palindrome (64226062246).

The spelling of 21014021234 in words is "twenty-one billion, fourteen million, twenty-one thousand, two hundred thirty-four".