140215170421 has 4 divisors (see below), whose sum is σ = 140234785344. Its totient is φ = 140195555500.

The previous prime is 140215170413. The next prime is 140215170439. The reversal of 140215170421 is 124071512041.

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 140215170421 - 2³ = 140215170413 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140215170421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140215170401) 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, 9796735 + ... + 9811036.

It is an arithmetic number, because the mean of its divisors is an integer number (35058696336).

Almost surely, 2^140215170421 is an apocalyptic number.

It is an amenable number.

140215170421 is a deficient number, since it is larger than the sum of its proper divisors (19614923).

140215170421 is an equidigital number, since it uses as much as digits as its factorization.

140215170421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19614922.

The product of its (nonzero) digits is 2240, while the sum is 28.

Adding to 140215170421 its reverse (124071512041), we get a palindrome (264286682462).

The spelling of 140215170421 in words is "one hundred forty billion, two hundred fifteen million, one hundred seventy thousand, four hundred twenty-one".