21221001022104 has 48 divisors (see below), whose sum is σ = 61894586317200. Its totient is φ = 6529538775744.

The previous prime is 21221001022043. The next prime is 21221001022121. The reversal of 21221001022104 is 40122010012212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11336003884 + ... + 11336005755.

It is an arithmetic number, because the mean of its divisors is an integer number (1289470548275).

Almost surely, 2^{21221001022104} is an apocalyptic number.

21221001022104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21221001022104 is an abundant number, since it is smaller than the sum of its proper divisors (40673585295096).

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

21221001022104 is a wasteful number, since it uses less digits than its factorization.

21221001022104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22672009664 (or 22672009657 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21221001022104 its reverse (40122010012212), we get a palindrome (61343011034316).

The spelling of 21221001022104 in words is "twenty-one trillion, two hundred twenty-one billion, one million, twenty-two thousand, one hundred four".