140121421 has 4 divisors (see below), whose sum is σ = 152859744. Its totient is φ = 127383100.

The previous prime is 140121407. The next prime is 140121427. The reversal of 140121421 is 124121041.

It is a happy number.

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 140121421 - 2⁹ = 140120909 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140121395 and 140121404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140121427) 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, 6369145 + ... + 6369166.

It is an arithmetic number, because the mean of its divisors is an integer number (38214936).

Almost surely, 2^140121421 is an apocalyptic number.

140121421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140121421 is a deficient number, since it is larger than the sum of its proper divisors (12738323).

140121421 is a wasteful number, since it uses less digits than its factorization.

140121421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12738322.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 140121421 is about 11837.2894279054. The cubic root of 140121421 is about 519.3994805767.

Adding to 140121421 its reverse (124121041), we get a palindrome (264242462).

It can be divided in two parts, 1401 and 21421, that added together give a palindrome (22822).

The spelling of 140121421 in words is "one hundred forty million, one hundred twenty-one thousand, four hundred twenty-one".