213154021620 has 288 divisors, whose sum is σ = 692897587200. Its totient is φ = 52852027392.

The previous prime is 213154021607. The next prime is 213154021631. The reversal of 213154021620 is 26120451312.

213154021620 is a `hidden beast` number, since 2 + 1 + 3 + 15 + 4 + 0 + 21 + 620 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 166656141 + ... + 166657419.

It is an arithmetic number, because the mean of its divisors is an integer number (2405894400).

Almost surely, 2^213154021620 is an apocalyptic number.

213154021620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 213154021620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (346448793600).

213154021620 is an abundant number, since it is smaller than the sum of its proper divisors (479743565580).

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

213154021620 is a wasteful number, since it uses less digits than its factorization.

213154021620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1927 (or 1922 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

Adding to 213154021620 its reverse (26120451312), we get a palindrome (239274472932).

The spelling of 213154021620 in words is "two hundred thirteen billion, one hundred fifty-four million, twenty-one thousand, six hundred twenty".