21401020422 has 16 divisors (see below), whose sum is σ = 47557823280. Its totient is φ = 7133673456.

The previous prime is 21401020397. The next prime is 21401020423. The reversal of 21401020422 is 22402010412.

21401020422 is a `hidden beast` number, since 2 + 140 + 102 + 0 + 422 = 666.

It is a super-2 number, since 2×21401020422² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 21401020395 and 21401020404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21401020423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 198157543 + ... + 198157650.

It is an arithmetic number, because the mean of its divisors is an integer number (2972363955).

Almost surely, 2^21401020422 is an apocalyptic number.

21401020422 is an abundant number, since it is smaller than the sum of its proper divisors (26156802858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21401020422 is a wasteful number, since it uses less digits than its factorization.

21401020422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396315204 (or 396315198 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 21401020422 its reverse (22402010412), we get a palindrome (43803030834).

It can be divided in two parts, 214010 and 20422, that added together give a palindrome (234432).

The spelling of 21401020422 in words is "twenty-one billion, four hundred one million, twenty thousand, four hundred twenty-two".