142121001 has 16 divisors (see below), whose sum is σ = 208355328. Its totient is φ = 85453200.

The previous prime is 142120991. The next prime is 142121009. The reversal of 142121001 is 100121241.

It is a happy number.

It is not a de Polignac number, because 142121001 - 2¹¹ = 142118953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (142121009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12765 + ... + 21146.

It is an arithmetic number, because the mean of its divisors is an integer number (13022208).

Almost surely, 2^142121001 is an apocalyptic number.

142121001 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

142121001 is a deficient number, since it is larger than the sum of its proper divisors (66234327).

142121001 is a wasteful number, since it uses less digits than its factorization.

142121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34052.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 142121001 is about 11921.4512958784. The cubic root of 142121001 is about 521.8584891139.

Adding to 142121001 its reverse (100121241), we get a palindrome (242242242).

It can be divided in two parts, 1421 and 21001, that added together give a palindrome (22422).

The spelling of 142121001 in words is "one hundred forty-two million, one hundred twenty-one thousand, one".