21021201210312 has 24 divisors (see below), whose sum is σ = 56932419944790. Its totient is φ = 7007067070080.

The previous prime is 21021201210239. The next prime is 21021201210323. The reversal of 21021201210312 is 21301210212012.

21021201210312 is a `hidden beast` number, since 21 + 0 + 2 + 120 + 1 + 210 + 312 = 666.

It can be written as a sum of positive squares in only one way, i.e., 19396325823876 + 1624875386436 = 4404126^2 + 1274706^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 145980563889 + ... + 145980564032.

Almost surely, 2^{21021201210312} is an apocalyptic number.

It is an amenable number.

21021201210312 is an abundant number, since it is smaller than the sum of its proper divisors (35911218734478).

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

21021201210312 is a wasteful number, since it uses less digits than its factorization.

21021201210312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291961127933 (or 291961127926 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21021201210312 its reverse (21301210212012), we get a palindrome (42322411422324).

The spelling of 21021201210312 in words is "twenty-one trillion, twenty-one billion, two hundred one million, two hundred ten thousand, three hundred twelve".