21014041042 has 4 divisors (see below), whose sum is σ = 31521061566. Its totient is φ = 10507020520.

The previous prime is 21014040997. The next prime is 21014041091. The reversal of 21014041042 is 24014041012.

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., 12816730521 + 8197310521 = 113211^2 + 90539^2 .

It is a super-3 number, since 3×21014041042³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5253510259 + ... + 5253510262.

Almost surely, 2^21014041042 is an apocalyptic number.

21014041042 is a deficient number, since it is larger than the sum of its proper divisors (10507020524).

21014041042 is a wasteful number, since it uses less digits than its factorization.

21014041042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10507020523.

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 21014041042 its reverse (24014041012), we get a palindrome (45028082054).

The spelling of 21014041042 in words is "twenty-one billion, fourteen million, forty-one thousand, forty-two".