140040021 has 16 divisors (see below), whose sum is σ = 204922368. Its totient is φ = 84361200.

The previous prime is 140040001. The next prime is 140040029. The reversal of 140040021 is 120040041.

140040021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-140040021 is a prime.

It is a super-2 number, since 2×140040021² = 39222414963360882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 140039979 and 140040006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140040029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7195 + ... + 18216.

It is an arithmetic number, because the mean of its divisors is an integer number (12807648).

Almost surely, 2^140040021 is an apocalyptic number.

140040021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

140040021 is a deficient number, since it is larger than the sum of its proper divisors (64882347).

140040021 is a wasteful number, since it uses less digits than its factorization.

140040021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25592.

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 140040021 is about 11833.8506412748. The cubic root of 140040021 is about 519.2988837584.

Adding to 140040021 its reverse (120040041), we get a palindrome (260080062).

The spelling of 140040021 in words is "one hundred forty million, forty thousand, twenty-one".