21012011101212 has 96 divisors (see below), whose sum is σ = 49347436045824. Its totient is φ = 6958516857600.

The previous prime is 21012011101177. The next prime is 21012011101229. The reversal of 21012011101212 is 21210111021012.

It is a happy number.

It is a super-2 number, since 2×21012011101212² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21012011101191 and 21012011101200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5799614833 + ... + 5799618455.

It is an arithmetic number, because the mean of its divisors is an integer number (514035792144).

Almost surely, 2^{21012011101212} is an apocalyptic number.

It is an amenable number.

21012011101212 is an abundant number, since it is smaller than the sum of its proper divisors (28335424944612).

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

21012011101212 is a wasteful number, since it uses less digits than its factorization.

21012011101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7739 (or 7737 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21012011101212 its reverse (21210111021012), we get a palindrome (42222122122224).

The spelling of 21012011101212 in words is "twenty-one trillion, twelve billion, eleven million, one hundred one thousand, two hundred twelve".