142421721 has 8 divisors (see below), whose sum is σ = 204503040. Its totient is φ = 87644112.

The previous prime is 142421711. The next prime is 142421723. The reversal of 142421721 is 127124241.

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

It is not a de Polignac number, because 142421721 - 2⁷ = 142421593 is a prime.

It is a super-2 number, since 2×142421721² = 40567893225203682, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 142421691 and 142421700.

It is not an unprimeable number, because it can be changed into a prime (142421723) 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, 1825881 + ... + 1825958.

It is an arithmetic number, because the mean of its divisors is an integer number (25562880).

Almost surely, 2^142421721 is an apocalyptic number.

It is an amenable number.

142421721 is a deficient number, since it is larger than the sum of its proper divisors (62081319).

142421721 is a wasteful number, since it uses less digits than its factorization.

142421721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3651855.

The product of its digits is 896, while the sum is 24.

The square root of 142421721 is about 11934.0571894055. The cubic root of 142421721 is about 522.2263041597.

Adding to 142421721 its reverse (127124241), we get a palindrome (269545962).

The spelling of 142421721 in words is "one hundred forty-two million, four hundred twenty-one thousand, seven hundred twenty-one".