21011121203020 has 96 divisors (see below), whose sum is σ = 50593681252800. Its totient is φ = 7260810952704.

The previous prime is 21011121202987. The next prime is 21011121203041. The reversal of 21011121203020 is 2030212111012.

It is a super-2 number, since 2×21011121203020² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011121202985 and 21011121203003.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12487165 + ... + 14069524.

It is an arithmetic number, because the mean of its divisors is an integer number (527017513050).

Almost surely, 2^{21011121203020} is an apocalyptic number.

21011121203020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21011121203020 is an abundant number, since it is smaller than the sum of its proper divisors (29582560049780).

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

21011121203020 is a wasteful number, since it uses less digits than its factorization.

21011121203020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26556907 (or 26556905 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21011121203020 its reverse (2030212111012), we get a palindrome (23041333314032).

The spelling of 21011121203020 in words is "twenty-one trillion, eleven billion, one hundred twenty-one million, two hundred three thousand, twenty".