21033034401421 has 24 divisors (see below), whose sum is σ = 25793624503296. Its totient is φ = 17075549000160.

The previous prime is 21033034401391. The next prime is 21033034401433. The reversal of 21033034401421 is 12410443033012.

It is a happy number.

It is not a de Polignac number, because 21033034401421 - 2⁵ = 21033034401389 is a prime.

It is a super-2 number, since 2×21033034401421² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21033034401421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21033034401481) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 147233206 + ... + 147375991.

It is an arithmetic number, because the mean of its divisors is an integer number (1074734354304).

Almost surely, 2^{21033034401421} is an apocalyptic number.

It is an amenable number.

21033034401421 is a deficient number, since it is larger than the sum of its proper divisors (4760590101875).

21033034401421 is a wasteful number, since it uses less digits than its factorization.

21033034401421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294609289 (or 294609282 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 21033034401421 its reverse (12410443033012), we get a palindrome (33443477434433).

The spelling of 21033034401421 in words is "twenty-one trillion, thirty-three billion, thirty-four million, four hundred one thousand, four hundred twenty-one".