421105021 has 8 divisors (see below), whose sum is σ = 428372384. Its totient is φ = 413849520.

The previous prime is 421104991. The next prime is 421105031. The reversal of 421105021 is 120501124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 421105021 - 2⁵ = 421104989 is a prime.

It is a super-2 number, since 2×421105021² = 354658877422820882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 421104986 and 421105004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421105031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97126 + ... + 101368.

It is an arithmetic number, because the mean of its divisors is an integer number (53546548).

Almost surely, 2^421105021 is an apocalyptic number.

It is an amenable number.

421105021 is a deficient number, since it is larger than the sum of its proper divisors (7267363).

421105021 is a wasteful number, since it uses less digits than its factorization.

421105021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5931.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 421105021 is about 20520.8435742783. The cubic root of 421105021 is about 749.5434382731.

Adding to 421105021 its reverse (120501124), we get a palindrome (541606145).

The spelling of 421105021 in words is "four hundred twenty-one million, one hundred five thousand, twenty-one".