213221001020 has 48 divisors (see below), whose sum is σ = 463226795136. Its totient is φ = 82384320000.

The previous prime is 213221000977. The next prime is 213221001029. The reversal of 213221001020 is 20100122312.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 213221000986 and 213221001004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213221001029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1204436 + ... + 1370075.

It is an arithmetic number, because the mean of its divisors is an integer number (9650558232).

Almost surely, 2^213221001020 is an apocalyptic number.

213221001020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213221001020 is an abundant number, since it is smaller than the sum of its proper divisors (250005794116).

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

213221001020 is a wasteful number, since it uses less digits than its factorization.

213221001020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2574662 (or 2574660 counting only the distinct ones).

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

Adding to 213221001020 its reverse (20100122312), we get a palindrome (233321123332).

The spelling of 213221001020 in words is "two hundred thirteen billion, two hundred twenty-one million, one thousand, twenty".