21401420442 has 8 divisors (see below), whose sum is σ = 42802840896. Its totient is φ = 7133806812.

The previous prime is 21401420441. The next prime is 21401420459. The reversal of 21401420442 is 24402410412.

It is a sphenic number, since it is the product of 3 distinct primes.

21401420442 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21401420441) 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, 1783451698 + ... + 1783451709.

It is an arithmetic number, because the mean of its divisors is an integer number (5350355112).

Almost surely, 2^21401420442 is an apocalyptic number.

21401420442 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21401420442 is a wasteful number, since it uses less digits than its factorization.

21401420442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3566903412.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 21401420442 its reverse (24402410412), we get a palindrome (45803830854).

The spelling of 21401420442 in words is "twenty-one billion, four hundred one million, four hundred twenty thousand, four hundred forty-two".