21230211020 has 24 divisors (see below), whose sum is σ = 44783378304. Its totient is φ = 8454001536.

The previous prime is 21230211011. The next prime is 21230211043. The reversal of 21230211020 is 2011203212.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21230210986 and 21230211004.

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, 2375609 + ... + 2384528.

It is an arithmetic number, because the mean of its divisors is an integer number (1865974096).

Almost surely, 2^21230211020 is an apocalyptic number.

21230211020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21230211020 is an abundant number, since it is smaller than the sum of its proper divisors (23553167284).

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

21230211020 is a wasteful number, since it uses less digits than its factorization.

21230211020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4760369 (or 4760367 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21230211020 its reverse (2011203212), we get a palindrome (23241414232).

It can be divided in two parts, 212302 and 11020, that added together give a palindrome (223322).

The spelling of 21230211020 in words is "twenty-one billion, two hundred thirty million, two hundred eleven thousand, twenty".