21020220011012 has 12 divisors (see below), whose sum is σ = 36785514955980. Its totient is φ = 10510072880736.

The previous prime is 21020220010921. The next prime is 21020220011101. The reversal of 21020220011012 is 21011002202012.

It can be written as a sum of positive squares in 2 ways, for example, as 16630214496256 + 4390005514756 = 4078016^2 + 2095234^2 .

It is a super-3 number, since 3×21020220011012³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7987187 + ... + 10287642.

It is an arithmetic number, because the mean of its divisors is an integer number (3065459579665).

Almost surely, 2^{21020220011012} is an apocalyptic number.

It is an amenable number.

21020220011012 is a deficient number, since it is larger than the sum of its proper divisors (15765294944968).

21020220011012 is a wasteful number, since it uses less digits than its factorization.

21020220011012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18562390 (or 18562388 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21020220011012 its reverse (21011002202012), we get a palindrome (42031222213024).

The spelling of 21020220011012 in words is "twenty-one trillion, twenty billion, two hundred twenty million, eleven thousand, twelve".