21201012111012 has 48 divisors (see below), whose sum is σ = 49729473162432. Its totient is φ = 7029803704320.

The previous prime is 21201012111001. The next prime is 21201012111023. The reversal of 21201012111012 is 21011121010212.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21201012111001) and next prime (21201012111023).

It is a super-2 number, since 2×21201012111012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21201012110982 and 21201012111000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27976243 + ... + 28724069.

It is an arithmetic number, because the mean of its divisors is an integer number (1036030690884).

Almost surely, 2^{21201012111012} is an apocalyptic number.

It is an amenable number.

21201012111012 is an abundant number, since it is smaller than the sum of its proper divisors (28528461051420).

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

21201012111012 is a wasteful number, since it uses less digits than its factorization.

21201012111012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760268 (or 760266 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21201012111012 its reverse (21011121010212), we get a palindrome (42212133121224).

The spelling of 21201012111012 in words is "twenty-one trillion, two hundred one billion, twelve million, one hundred eleven thousand, twelve".