140386021 has 2 divisors, whose sum is σ = 140386022. Its totient is φ = 140386020.

The previous prime is 140386007. The next prime is 140386031. The reversal of 140386021 is 120683041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138909796 + 1476225 = 11786^2 + 1215^2 .

It is a cyclic number.

It is not a de Polignac number, because 140386021 - 2¹³ = 140377829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140386031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70193010 + 70193011.

It is an arithmetic number, because the mean of its divisors is an integer number (70193011).

Almost surely, 2^140386021 is an apocalyptic number.

It is an amenable number.

140386021 is a deficient number, since it is larger than the sum of its proper divisors (1).

140386021 is an equidigital number, since it uses as much as digits as its factorization.

140386021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 140386021 is about 11848.4607017114. The cubic root of 140386021 is about 519.7262131214.

The spelling of 140386021 in words is "one hundred forty million, three hundred eighty-six thousand, twenty-one".