21001120022004 has 48 divisors (see below), whose sum is σ = 49036188499200. Its totient is φ = 6995578064896.

The previous prime is 21001120021993. The next prime is 21001120022009. The reversal of 21001120022004 is 40022002110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001120022009) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152645557 + ... + 152783075.

It is an arithmetic number, because the mean of its divisors is an integer number (1021587260400).

Almost surely, 2^{21001120022004} is an apocalyptic number.

It is an amenable number.

21001120022004 is an abundant number, since it is smaller than the sum of its proper divisors (28035068477196).

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

21001120022004 is a wasteful number, since it uses less digits than its factorization.

21001120022004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146152 (or 146150 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21001120022004 its reverse (40022002110012), we get a palindrome (61023122132016).

The spelling of 21001120022004 in words is "twenty-one trillion, one billion, one hundred twenty million, twenty-two thousand, four".