81421354 has 8 divisors (see below), whose sum is σ = 139579488. Its totient is φ = 34894860.

The previous prime is 81421339. The next prime is 81421363. The reversal of 81421354 is 45312418.

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

It is a super-3 number, since 3×81421354³ (a number of 25 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2907892 + ... + 2907919.

It is an arithmetic number, because the mean of its divisors is an integer number (17447436).

Almost surely, 2^81421354 is an apocalyptic number.

81421354 is a deficient number, since it is larger than the sum of its proper divisors (58158134).

81421354 is a wasteful number, since it uses less digits than its factorization.

81421354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5815820.

The product of its digits is 3840, while the sum is 28.

The square root of 81421354 is about 9023.3781922293. The cubic root of 81421354 is about 433.4238179224.

The spelling of 81421354 in words is "eighty-one million, four hundred twenty-one thousand, three hundred fifty-four".