21121145212 has 6 divisors (see below), whose sum is σ = 36962004128. Its totient is φ = 10560572604.

The previous prime is 21121145183. The next prime is 21121145273. The reversal of 21121145212 is 21254112112.

It is a super-2 number, since 2×21121145212² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2640143148 + ... + 2640143155.

Almost surely, 2^21121145212 is an apocalyptic number.

It is an amenable number.

21121145212 is a deficient number, since it is larger than the sum of its proper divisors (15840858916).

21121145212 is a wasteful number, since it uses less digits than its factorization.

21121145212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5280286307 (or 5280286305 counting only the distinct ones).

The product of its digits is 320, while the sum is 22.

Adding to 21121145212 its reverse (21254112112), we get a palindrome (42375257324).

The spelling of 21121145212 in words is "twenty-one billion, one hundred twenty-one million, one hundred forty-five thousand, two hundred twelve".