21211211010012 has 48 divisors (see below), whose sum is σ = 49956478572672. Its totient is φ = 7004170463040.

The previous prime is 21211211010001. The next prime is 21211211010047. The reversal of 21211211010012 is 21001011211212.

It is a happy number.

It is a super-2 number, since 2×21211211010012² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21211211009973 and 21211211010000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67871703 + ... + 68183505.

It is an arithmetic number, because the mean of its divisors is an integer number (1040759970264).

Almost surely, 2^{21211211010012} is an apocalyptic number.

It is an amenable number.

21211211010012 is an abundant number, since it is smaller than the sum of its proper divisors (28745267562660).

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

21211211010012 is a wasteful number, since it uses less digits than its factorization.

21211211010012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364898 (or 364896 counting only the distinct ones).

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

Adding to 21211211010012 its reverse (21001011211212), we get a palindrome (42212222221224).

The spelling of 21211211010012 in words is "twenty-one trillion, two hundred eleven billion, two hundred eleven million, ten thousand, twelve".