140121001 has 4 divisors (see below), whose sum is σ = 140679504. Its totient is φ = 139562500.

The previous prime is 140120999. The next prime is 140121049. The reversal of 140121001 is 100121041.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 140121001 - 2¹ = 140120999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140121071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 278875 + ... + 279376.

It is an arithmetic number, because the mean of its divisors is an integer number (35169876).

Almost surely, 2^140121001 is an apocalyptic number.

It is an amenable number.

140121001 is a deficient number, since it is larger than the sum of its proper divisors (558503).

140121001 is an equidigital number, since it uses as much as digits as its factorization.

140121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558502.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 140121001 is about 11837.2716873442. The cubic root of 140121001 is about 519.3989616267.

Adding to 140121001 its reverse (100121041), we get a palindrome (240242042).

The spelling of 140121001 in words is "one hundred forty million, one hundred twenty-one thousand, one".