142810921 has 8 divisors (see below), whose sum is σ = 156482784. Its totient is φ = 129253920.

The previous prime is 142810873. The next prime is 142810949. The reversal of 142810921 is 129018241.

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 142810921 - 2⁷ = 142810793 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 142810921.

It is not an unprimeable number, because it can be changed into a prime (142810721) 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, 26100 + ... + 31093.

It is an arithmetic number, because the mean of its divisors is an integer number (19560348).

Almost surely, 2^142810921 is an apocalyptic number.

142810921 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142810921 is a deficient number, since it is larger than the sum of its proper divisors (13671863).

142810921 is a wasteful number, since it uses less digits than its factorization.

142810921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57431.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 142810921 is about 11950.3523379020. The cubic root of 142810921 is about 522.7015725244.

The spelling of 142810921 in words is "one hundred forty-two million, eight hundred ten thousand, nine hundred twenty-one".