21321321444010 has 32 divisors (see below), whose sum is σ = 45275875218432. Its totient is φ = 7074355501440.

The previous prime is 21321321443963. The next prime is 21321321444061. The reversal of 21321321444010 is 1044412312312.

It is a happy number.

It is a super-4 number, since 4×21321321444010⁴ (a number of 54 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21321321444010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4912744707 + ... + 4912749046.

It is an arithmetic number, because the mean of its divisors is an integer number (1414871100576).

Almost surely, 2^{21321321444010} is an apocalyptic number.

21321321444010 is an abundant number, since it is smaller than the sum of its proper divisors (23954553774422).

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

21321321444010 is a wasteful number, since it uses less digits than its factorization.

21321321444010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9825493798.

The product of its (nonzero) digits is 4608, while the sum is 28.

Adding to 21321321444010 its reverse (1044412312312), we get a palindrome (22365733756322).

The spelling of 21321321444010 in words is "twenty-one trillion, three hundred twenty-one billion, three hundred twenty-one million, four hundred forty-four thousand, ten".