21011203012 has 12 divisors (see below), whose sum is σ = 36783147520. Its totient is φ = 10501732296.

The previous prime is 21011203009. The next prime is 21011203039. The reversal of 21011203012 is 21030211012.

It is a super-2 number, since 2×21011203012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21011202983 and 21011203001.

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, 955068 + ... + 976819.

Almost surely, 2^21011203012 is an apocalyptic number.

It is an amenable number.

21011203012 is a deficient number, since it is larger than the sum of its proper divisors (15771944508).

21011203012 is a wasteful number, since it uses less digits than its factorization.

21011203012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1934610 (or 1934608 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21011203012 its reverse (21030211012), we get a palindrome (42041414024).

The spelling of 21011203012 in words is "twenty-one billion, eleven million, two hundred three thousand, twelve".