21210211330 has 64 divisors (see below), whose sum is σ = 50398993152. Its totient is φ = 6222090240.

The previous prime is 21210211303. The next prime is 21210211331. The reversal of 21210211330 is 3311201212.

It is not an unprimeable number, because it can be changed into a prime (21210211331) 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, 797079 + ... + 823258.

It is an arithmetic number, because the mean of its divisors is an integer number (787484268).

Almost surely, 2^21210211330 is an apocalyptic number.

21210211330 is an abundant number, since it is smaller than the sum of its proper divisors (29188781822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21210211330 is a wasteful number, since it uses less digits than its factorization.

21210211330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1620379.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21210211330 its reverse (3311201212), we get a palindrome (24521412542).

The spelling of 21210211330 in words is "twenty-one billion, two hundred ten million, two hundred eleven thousand, three hundred thirty".