21011020101202 has 16 divisors (see below), whose sum is σ = 31570922896632. Its totient is φ = 10487381299200.

The previous prime is 21011020101133. The next prime is 21011020101241. The reversal of 21011020101202 is 20210102011012.

It can be written as a sum of positive squares in 4 ways, for example, as 19509809494081 + 1501210607121 = 4416991^2 + 1225239^2 .

It is a super-2 number, since 2×21011020101202² (a number of 27 digits) contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 19200858 + ... + 20265610.

Almost surely, 2^{21011020101202} is an apocalyptic number.

21011020101202 is a deficient number, since it is larger than the sum of its proper divisors (10559902795430).

21011020101202 is a wasteful number, since it uses less digits than its factorization.

21011020101202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081773.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21011020101202 its reverse (20210102011012), we get a palindrome (41221122112214).

The spelling of 21011020101202 in words is "twenty-one trillion, eleven billion, twenty million, one hundred one thousand, two hundred two".