21210015011 has 2 divisors, whose sum is σ = 21210015012. Its totient is φ = 21210015010.

The previous prime is 21210015007. The next prime is 21210015067. The reversal of 21210015011 is 11051001212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210015011 - 2² = 21210015007 is a prime.

It is not a weakly prime, because it can be changed into another prime (21210015091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605007505 + 10605007506.

It is an arithmetic number, because the mean of its divisors is an integer number (10605007506).

Almost surely, 2^21210015011 is an apocalyptic number.

21210015011 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210015011 is an equidigital number, since it uses as much as digits as its factorization.

21210015011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20, while the sum is 14.

Adding to 21210015011 its reverse (11051001212), we get a palindrome (32261016223).

The spelling of 21210015011 in words is "twenty-one billion, two hundred ten million, fifteen thousand, eleven".