421356021 has 8 divisors (see below), whose sum is σ = 586234560. Its totient is φ = 268690752.

The previous prime is 421356017. The next prime is 421356029. The reversal of 421356021 is 120653124.

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

It is not a de Polignac number, because 421356021 - 2² = 421356017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421355982 and 421356000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421356029) 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, 3053236 + ... + 3053373.

It is an arithmetic number, because the mean of its divisors is an integer number (73279320).

Almost surely, 2^421356021 is an apocalyptic number.

It is an amenable number.

421356021 is a deficient number, since it is larger than the sum of its proper divisors (164878539).

421356021 is a wasteful number, since it uses less digits than its factorization.

421356021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6106635.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 421356021 is about 20526.9583962164. The cubic root of 421356021 is about 749.6923306923.

The spelling of 421356021 in words is "four hundred twenty-one million, three hundred fifty-six thousand, twenty-one".