191421029 has 8 divisors (see below), whose sum is σ = 204048000. Its totient is φ = 179049312.

The previous prime is 191421011. The next prime is 191421031. The reversal of 191421029 is 920124191.

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

It is not a de Polignac number, because 191421029 - 2¹² = 191416933 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 191420992 and 191421010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191421049) 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, 62264 + ... + 65265.

It is an arithmetic number, because the mean of its divisors is an integer number (25506000).

Almost surely, 2^191421029 is an apocalyptic number.

191421029 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

191421029 is a deficient number, since it is larger than the sum of its proper divisors (12626971).

191421029 is a wasteful number, since it uses less digits than its factorization.

191421029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127627.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 191421029 is about 13835.4988706588. The cubic root of 191421029 is about 576.3193688087.

The spelling of 191421029 in words is "one hundred ninety-one million, four hundred twenty-one thousand, twenty-nine".