21203011223100 has 216 divisors, whose sum is σ = 80421774739488. Its totient is φ = 4561320038400.

The previous prime is 21203011223057. The next prime is 21203011223111. The reversal of 21203011223100 is 132211030212.

21203011223100 is a `hidden beast` number, since 2 + 120 + 301 + 12 + 231 + 0 + 0 = 666.

It is a super-4 number, since 4×21203011223100⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

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 71 ways as a sum of consecutive naturals, for example, 98879881 + ... + 99094080.

Almost surely, 2^{21203011223100} is an apocalyptic number.

21203011223100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21203011223100 is an abundant number, since it is smaller than the sum of its proper divisors (59218763516388).

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

21203011223100 is a wasteful number, since it uses less digits than its factorization.

21203011223100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197974005 (or 197973995 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21203011223100 its reverse (132211030212), we get a palindrome (21335222253312).

The spelling of 21203011223100 in words is "twenty-one trillion, two hundred three billion, eleven million, two hundred twenty-three thousand, one hundred".