21144040010 has 16 divisors (see below), whose sum is σ = 38517818976. Its totient is φ = 8355716688.

The previous prime is 21144039997. The next prime is 21144040019. The reversal of 21144040010 is 1004044112.

It is not an unprimeable number, because it can be changed into a prime (21144040019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12736544 + ... + 12738203.

It is an arithmetic number, because the mean of its divisors is an integer number (2407363686).

Almost surely, 2^21144040010 is an apocalyptic number.

21144040010 is a deficient number, since it is larger than the sum of its proper divisors (17373778966).

21144040010 is a wasteful number, since it uses less digits than its factorization.

21144040010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25474837.

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

Adding to 21144040010 its reverse (1004044112), we get a palindrome (22148084122).

The spelling of 21144040010 in words is "twenty-one billion, one hundred forty-four million, forty thousand, ten".