20140021421 has 16 divisors (see below), whose sum is σ = 21848400000. Its totient is φ = 18454536768.

The previous prime is 20140021417. The next prime is 20140021423. The reversal of 20140021421 is 12412004102.

It is a cyclic number.

It is not a de Polignac number, because 20140021421 - 2² = 20140021417 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 20140021421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20140021423) 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, 5807330 + ... + 5810796.

It is an arithmetic number, because the mean of its divisors is an integer number (1365525000).

Almost surely, 2^20140021421 is an apocalyptic number.

It is an amenable number.

20140021421 is a deficient number, since it is larger than the sum of its proper divisors (1708378579).

20140021421 is a wasteful number, since it uses less digits than its factorization.

20140021421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6628.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 20140021421 its reverse (12412004102), we get a palindrome (32552025523).

The spelling of 20140021421 in words is "twenty billion, one hundred forty million, twenty-one thousand, four hundred twenty-one".