21421033104043 has 4 divisors (see below), whose sum is σ = 21434915823088. Its totient is φ = 21407150385000.

The previous prime is 21421033103983. The next prime is 21421033104047. The reversal of 21421033104043 is 34040133012412.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21421033104043 - 2³⁷ = 21283594150571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21421033104047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6941357208 + ... + 6941360293.

It is an arithmetic number, because the mean of its divisors is an integer number (5358728955772).

Almost surely, 2^{21421033104043} is an apocalyptic number.

21421033104043 is a deficient number, since it is larger than the sum of its proper divisors (13882719045).

21421033104043 is a wasteful number, since it uses less digits than its factorization.

21421033104043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13882719044.

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21421033104043 its reverse (34040133012412), we get a palindrome (55461166116455).

The spelling of 21421033104043 in words is "twenty-one trillion, four hundred twenty-one billion, thirty-three million, one hundred four thousand, forty-three".