21210220020111 has 32 divisors (see below), whose sum is σ = 30678632022528. Its totient is φ = 12985663918080.

The previous prime is 21210220020103. The next prime is 21210220020211. The reversal of 21210220020111 is 11102002201212.

It is not a de Polignac number, because 21210220020111 - 2³ = 21210220020103 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21210220020211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29842365 + ... + 30544838.

It is an arithmetic number, because the mean of its divisors is an integer number (958707250704).

Almost surely, 2^{21210220020111} is an apocalyptic number.

21210220020111 is a deficient number, since it is larger than the sum of its proper divisors (9468412002417).

21210220020111 is a wasteful number, since it uses less digits than its factorization.

21210220020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60387391.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21210220020111 its reverse (11102002201212), we get a palindrome (32312222221323).

The spelling of 21210220020111 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, twenty thousand, one hundred eleven".