21442403010 has 64 divisors (see below), whose sum is σ = 59384512512. Its totient is φ = 4853532096.

The previous prime is 21442403009. The next prime is 21442403011. The reversal of 21442403010 is 1030424412.

It is an interprime number because it is at equal distance from previous prime (21442403009) and next prime (21442403011).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (21442403011) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 474034 + ... + 517293.

It is an arithmetic number, because the mean of its divisors is an integer number (927883008).

Almost surely, 2^21442403010 is an apocalyptic number.

21442403010 is an abundant number, since it is smaller than the sum of its proper divisors (37942109502).

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

21442403010 is a wasteful number, since it uses less digits than its factorization.

21442403010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 991447.

The product of its (nonzero) digits is 768, while the sum is 21.

Adding to 21442403010 its reverse (1030424412), we get a palindrome (22472827422).

The spelling of 21442403010 in words is "twenty-one billion, four hundred forty-two million, four hundred three thousand, ten".