142871221991 has 8 divisors (see below), whose sum is σ = 146570198544. Its totient is φ = 139182450880.

The previous prime is 142871221973. The next prime is 142871222009. The reversal of 142871221991 is 199122178241.

It is an interprime number because it is at equal distance from previous prime (142871221973) and next prime (142871222009).

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 142871221991 - 2²² = 142867027687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142871211991) 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, 2522996 + ... + 2579001.

It is an arithmetic number, because the mean of its divisors is an integer number (18321274818).

Almost surely, 2^142871221991 is an apocalyptic number.

142871221991 is a deficient number, since it is larger than the sum of its proper divisors (3698976553).

142871221991 is an equidigital number, since it uses as much as digits as its factorization.

142871221991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5102721.

The product of its digits is 145152, while the sum is 47.

The spelling of 142871221991 in words is "one hundred forty-two billion, eight hundred seventy-one million, two hundred twenty-one thousand, nine hundred ninety-one".