21211220232210 has 16 divisors (see below), whose sum is σ = 50906928557376. Its totient is φ = 5656325395248.

The previous prime is 21211220232197. The next prime is 21211220232229. The reversal of 21211220232210 is 1223202211212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353520337174 + ... + 353520337233.

It is an arithmetic number, because the mean of its divisors is an integer number (3181683034836).

Almost surely, 2^{21211220232210} is an apocalyptic number.

21211220232210 is an abundant number, since it is smaller than the sum of its proper divisors (29695708325166).

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

21211220232210 is a wasteful number, since it uses less digits than its factorization.

21211220232210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707040674417.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21211220232210 its reverse (1223202211212), we get a palindrome (22434422443422).

The spelling of 21211220232210 in words is "twenty-one trillion, two hundred eleven billion, two hundred twenty million, two hundred thirty-two thousand, two hundred ten".