21820912102 has 16 divisors (see below), whose sum is σ = 37586260800. Its totient is φ = 9396564840.

The previous prime is 21820912093. The next prime is 21820912103. The reversal of 21820912102 is 20121902812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21820912103) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26101152 + ... + 26101987.

It is an arithmetic number, because the mean of its divisors is an integer number (2349141300).

Almost surely, 2^21820912102 is an apocalyptic number.

21820912102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21820912102 is a deficient number, since it is larger than the sum of its proper divisors (15765348698).

21820912102 is a wasteful number, since it uses less digits than its factorization.

21820912102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52203171.

The product of its (nonzero) digits is 1152, while the sum is 28.

The spelling of 21820912102 in words is "twenty-one billion, eight hundred twenty million, nine hundred twelve thousand, one hundred two".