421156681 has 8 divisors (see below), whose sum is σ = 471861504. Its totient is φ = 372521520.

The previous prime is 421156621. The next prime is 421156699. The reversal of 421156681 is 186651124.

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 421156681 - 2⁷ = 421156553 is a prime.

It is a super-2 number, since 2×421156681² = 354745899901871522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (421156621) 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, 516985 + ... + 517798.

It is an arithmetic number, because the mean of its divisors is an integer number (58982688).

Almost surely, 2^421156681 is an apocalyptic number.

It is an amenable number.

421156681 is a deficient number, since it is larger than the sum of its proper divisors (50704823).

421156681 is a wasteful number, since it uses less digits than its factorization.

421156681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034831.

The product of its digits is 11520, while the sum is 34.

The square root of 421156681 is about 20522.1022558606. The cubic root of 421156681 is about 749.5740876588.

The spelling of 421156681 in words is "four hundred twenty-one million, one hundred fifty-six thousand, six hundred eighty-one".