140920521 has 16 divisors (see below), whose sum is σ = 219120000. Its totient is φ = 80525424.

The previous prime is 140920489. The next prime is 140920547. The reversal of 140920521 is 125029041.

It is not a de Polignac number, because 140920521 - 2⁵ = 140920489 is a prime.

It is a super-2 number, since 2×140920521² = 39717186477822882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 140920491 and 140920500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140920561) 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, 67446 + ... + 69503.

It is an arithmetic number, because the mean of its divisors is an integer number (13695000).

Almost surely, 2^140920521 is an apocalyptic number.

It is an amenable number.

140920521 is a deficient number, since it is larger than the sum of its proper divisors (78199479).

140920521 is an equidigital number, since it uses as much as digits as its factorization.

140920521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136973 (or 136959 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 140920521 is about 11870.9949456648. The cubic root of 140920521 is about 520.3849725652.

Adding to 140920521 its reverse (125029041), we get a palindrome (265949562).

The spelling of 140920521 in words is "one hundred forty million, nine hundred twenty thousand, five hundred twenty-one".