21020204031104 has 32 divisors (see below), whose sum is σ = 41878419614640. Its totient is φ = 10509541853440.

The previous prime is 21020204031103. The next prime is 21020204031133. The reversal of 21020204031104 is 40113040202012.

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (21020204031103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960082 + ... + 6773649.

Almost surely, 2^{21020204031104} is an apocalyptic number.

It is an amenable number.

21020204031104 is a deficient number, since it is larger than the sum of its proper divisors (20858215583536).

21020204031104 is an equidigital number, since it uses as much as digits as its factorization.

21020204031104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8752548 (or 8752536 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 21020204031104 its reverse (40113040202012), we get a palindrome (61133244233116).

The spelling of 21020204031104 in words is "twenty-one trillion, twenty billion, two hundred four million, thirty-one thousand, one hundred four".