421433213205021 has 16 divisors (see below), whose sum is σ = 586385049561984. Its totient is φ = 268720225647104.

The previous prime is 421433213204999. The next prime is 421433213205083. The reversal of 421433213205021 is 120502312334124.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 421433213205021 - 2⁶ = 421433213204957 is a prime.

It is a super-2 number, since 2×421433213205021² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421433213205721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 223992396 + ... + 225866021.

It is an arithmetic number, because the mean of its divisors is an integer number (36649065597624).

Almost surely, 2^{421433213205021} is an apocalyptic number.

It is an amenable number.

421433213205021 is a deficient number, since it is larger than the sum of its proper divisors (164951836356963).

421433213205021 is a wasteful number, since it uses less digits than its factorization.

421433213205021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449872020.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 421433213205021 its reverse (120502312334124), we get a palindrome (541935525539145).

The spelling of 421433213205021 in words is "four hundred twenty-one trillion, four hundred thirty-three billion, two hundred thirteen million, two hundred five thousand, twenty-one".