40021421205 has 16 divisors (see below), whose sum is σ = 64265451264. Its totient is φ = 21267698880.

The previous prime is 40021421201. The next prime is 40021421213. The reversal of 40021421205 is 50212412004.

40021421205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40021421205 - 2² = 40021421201 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40021421201) 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, 4811901 + ... + 4820210.

It is an arithmetic number, because the mean of its divisors is an integer number (4016590704).

Almost surely, 2^40021421205 is an apocalyptic number.

It is an amenable number.

40021421205 is a deficient number, since it is larger than the sum of its proper divisors (24244030059).

40021421205 is a wasteful number, since it uses less digits than its factorization.

40021421205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9632396.

The product of its (nonzero) digits is 640, while the sum is 21.

Adding to 40021421205 its reverse (50212412004), we get a palindrome (90233833209).

The spelling of 40021421205 in words is "forty billion, twenty-one million, four hundred twenty-one thousand, two hundred five".