21012020212112 has 10 divisors (see below), whose sum is σ = 40710789160998. Its totient is φ = 10506010106048.

The previous prime is 21012020212093. The next prime is 21012020212159. The reversal of 21012020212112 is 21121202021012.

It can be written as a sum of positive squares in only one way, i.e., 12056700620176 + 8955319591936 = 3472276^2 + 2992544^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656625631613 + ... + 656625631644.

Almost surely, 2^{21012020212112} is an apocalyptic number.

It is an amenable number.

21012020212112 is a deficient number, since it is larger than the sum of its proper divisors (19698768948886).

21012020212112 is a wasteful number, since it uses less digits than its factorization.

21012020212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1313251263265 (or 1313251263259 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012020212112 its reverse (21121202021012), we get a palindrome (42133222233124).

The spelling of 21012020212112 in words is "twenty-one trillion, twelve billion, twenty million, two hundred twelve thousand, one hundred twelve".