21122031212 has 12 divisors (see below), whose sum is σ = 36965017656. Its totient is φ = 10560597600.

The previous prime is 21122031197. The next prime is 21122031277. The reversal of 21122031212 is 21213022112.

It is a super-2 number, since 2×21122031212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27803 + ... + 207405.

It is an arithmetic number, because the mean of its divisors is an integer number (3080418138).

Almost surely, 2^21122031212 is an apocalyptic number.

It is an amenable number.

21122031212 is a deficient number, since it is larger than the sum of its proper divisors (15842986444).

21122031212 is a wasteful number, since it uses less digits than its factorization.

21122031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209008 (or 209006 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21122031212 its reverse (21213022112), we get a palindrome (42335053324).

The spelling of 21122031212 in words is "twenty-one billion, one hundred twenty-two million, thirty-one thousand, two hundred twelve".