21211021012 has 12 divisors (see below), whose sum is σ = 37147783456. Its totient is φ = 10597368600.

The previous prime is 21211021003. The next prime is 21211021081. The reversal of 21211021012 is 21012011212.

It is a junction number, because it is equal to n+sod(n) for n = 21211020983 and 21211021001.

It is a congruent number.

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, 2029614 + ... + 2040037.

Almost surely, 2^21211021012 is an apocalyptic number.

It is an amenable number.

21211021012 is a deficient number, since it is larger than the sum of its proper divisors (15936762444).

21211021012 is a wasteful number, since it uses less digits than its factorization.

21211021012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4070958 (or 4070956 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21211021012 its reverse (21012011212), we get a palindrome (42223032224).

The spelling of 21211021012 in words is "twenty-one billion, two hundred eleven million, twenty-one thousand, twelve".