21121020212203 has 16 divisors (see below), whose sum is σ = 22412859356160. Its totient is φ = 19834678727296.

The previous prime is 21121020212197. The next prime is 21121020212213. The reversal of 21121020212203 is 30221202012112.

It is not a de Polignac number, because 21121020212203 - 2⁹ = 21121020211691 is a prime.

It is a super-2 number, since 2×21121020212203² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21121020212213) 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, 126615150 + ... + 126781852.

It is an arithmetic number, because the mean of its divisors is an integer number (1400803709760).

Almost surely, 2^{21121020212203} is an apocalyptic number.

21121020212203 is a deficient number, since it is larger than the sum of its proper divisors (1291839143957).

21121020212203 is a wasteful number, since it uses less digits than its factorization.

21121020212203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183146.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21121020212203 its reverse (30221202012112), we get a palindrome (51342222224315).

The spelling of 21121020212203 in words is "twenty-one trillion, one hundred twenty-one billion, twenty million, two hundred twelve thousand, two hundred three".