21111201021012 has 24 divisors (see below), whose sum is σ = 49262641987776. Its totient is φ = 7036613730048.

The previous prime is 21111201021011. The next prime is 21111201021013. The reversal of 21111201021012 is 21012010211112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21111201021011) and next prime (21111201021013).

It is a super-2 number, since 2×21111201021012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21111201020982 and 21111201021000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111201021011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 56465533 + ... + 56838180.

It is an arithmetic number, because the mean of its divisors is an integer number (2052610082824).

Almost surely, 2^{21111201021012} is an apocalyptic number.

It is an amenable number.

21111201021012 is an abundant number, since it is smaller than the sum of its proper divisors (28151440966764).

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

21111201021012 is a wasteful number, since it uses less digits than its factorization.

21111201021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113319247 (or 113319245 counting only the distinct ones).

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

Adding to 21111201021012 its reverse (21012010211112), we get a palindrome (42123211232124).

The spelling of 21111201021012 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, twenty-one thousand, twelve".