21020100121012 has 6 divisors (see below), whose sum is σ = 36785175211778. Its totient is φ = 10510050060504.

The previous prime is 21020100121003. The next prime is 21020100121021. The reversal of 21020100121012 is 21012100102012.

It is an interprime number because it is at equal distance from previous prime (21020100121003) and next prime (21020100121021).

It can be written as a sum of positive squares in only one way, i.e., 18508116035236 + 2511984085776 = 4302106^2 + 1584924^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21020100120983 and 21020100121001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2627512515123 + ... + 2627512515130.

Almost surely, 2^{21020100121012} is an apocalyptic number.

It is an amenable number.

21020100121012 is a deficient number, since it is larger than the sum of its proper divisors (15765075090766).

21020100121012 is a wasteful number, since it uses less digits than its factorization.

21020100121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5255025030257 (or 5255025030255 counting only the distinct ones).

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

Adding to 21020100121012 its reverse (21012100102012), we get a palindrome (42032200223024).

The spelling of 21020100121012 in words is "twenty-one trillion, twenty billion, one hundred million, one hundred twenty-one thousand, twelve".