21111031012 has 12 divisors (see below), whose sum is σ = 36948104956. Its totient is φ = 10554429600.

The previous prime is 21111031003. The next prime is 21111031021. The reversal of 21111031012 is 21013011112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21111031003) and next prime (21111031021).

It can be written as a sum of positive squares in 2 ways, for example, as 16919245476 + 4191785536 = 130074^2 + 64744^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21111030983 and 21111031001.

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, 226923 + ... + 306130.

Almost surely, 2^21111031012 is an apocalyptic number.

It is an amenable number.

21111031012 is a deficient number, since it is larger than the sum of its proper divisors (15837073944).

21111031012 is a wasteful number, since it uses less digits than its factorization.

21111031012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542958 (or 542956 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 13.

Adding to 21111031012 its reverse (21013011112), we get a palindrome (42124042124).

The spelling of 21111031012 in words is "twenty-one billion, one hundred eleven million, thirty-one thousand, twelve".