21001010101212 has 24 divisors (see below), whose sum is σ = 49002532966800. Its totient is φ = 7000311548416.

The previous prime is 21001010101199. The next prime is 21001010101241. The reversal of 21001010101212 is 21210101010012.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 504364 + ... + 6500492.

It is an arithmetic number, because the mean of its divisors is an integer number (2041772206950).

Almost surely, 2^{21001010101212} is an apocalyptic number.

It is an amenable number.

21001010101212 is an abundant number, since it is smaller than the sum of its proper divisors (28001522865588).

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

21001010101212 is a wasteful number, since it uses less digits than its factorization.

21001010101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6288005 (or 6288003 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21001010101212 its reverse (21210101010012), we get a palindrome (42211111111224).

The spelling of 21001010101212 in words is "twenty-one trillion, one billion, ten million, one hundred one thousand, two hundred twelve".