21121221022203 has 32 divisors (see below), whose sum is σ = 28818899905536. Its totient is φ = 13756027225248.

The previous prime is 21121221022177. The next prime is 21121221022211. The reversal of 21121221022203 is 30222012212112.

It is not a de Polignac number, because 21121221022203 - 2⁸ = 21121221021947 is a prime.

It is a super-2 number, since 2×21121221022203² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21121221022203.

It is not an unprimeable number, because it can be changed into a prime (21121221022273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14610100 + ... + 15990542.

It is an arithmetic number, because the mean of its divisors is an integer number (900590622048).

Almost surely, 2^{21121221022203} is an apocalyptic number.

21121221022203 is a deficient number, since it is larger than the sum of its proper divisors (7697678883333).

21121221022203 is a wasteful number, since it uses less digits than its factorization.

21121221022203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381143.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21121221022203 its reverse (30222012212112), we get a palindrome (51343233234315).

The spelling of 21121221022203 in words is "twenty-one trillion, one hundred twenty-one billion, two hundred twenty-one million, twenty-two thousand, two hundred three".