21210012011 has 8 divisors (see below), whose sum is σ = 21571799040. Its totient is φ = 20848301608.

The previous prime is 21210012001. The next prime is 21210012013. The reversal of 21210012011 is 11021001212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210012011 - 2¹⁴ = 21209995627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210011983 and 21210012001.

It is not an unprimeable number, because it can be changed into a prime (21210012013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 968990 + ... + 990636.

It is an arithmetic number, because the mean of its divisors is an integer number (2696474880).

Almost surely, 2^21210012011 is an apocalyptic number.

21210012011 is a deficient number, since it is larger than the sum of its proper divisors (361787029).

21210012011 is a wasteful number, since it uses less digits than its factorization.

21210012011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38313.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21210012011 its reverse (11021001212), we get a palindrome (32231013223).

The spelling of 21210012011 in words is "twenty-one billion, two hundred ten million, twelve thousand, eleven".