10421004021 has 4 divisors (see below), whose sum is σ = 13894672032. Its totient is φ = 6947336012.

The previous prime is 10421004017. The next prime is 10421004023. The reversal of 10421004021 is 12040012401.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10421004021 - 2² = 10421004017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10421004023) 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, 1736834001 + ... + 1736834006.

It is an arithmetic number, because the mean of its divisors is an integer number (3473668008).

Almost surely, 2^10421004021 is an apocalyptic number.

It is an amenable number.

10421004021 is a deficient number, since it is larger than the sum of its proper divisors (3473668011).

10421004021 is an equidigital number, since it uses as much as digits as its factorization.

10421004021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3473668010.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 10421004021 its reverse (12040012401), we get a palindrome (22461016422).

The spelling of 10421004021 in words is "ten billion, four hundred twenty-one million, four thousand, twenty-one".