211220001330 has 128 divisors (see below), whose sum is σ = 564015384576. Its totient is φ = 50272358400.

The previous prime is 211220001323. The next prime is 211220001347. The reversal of 211220001330 is 33100022112.

It is a super-2 number, since 2×211220001330² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 15432090 + ... + 15445770.

It is an arithmetic number, because the mean of its divisors is an integer number (4406370192).

Almost surely, 2^211220001330 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211220001330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (282007692288).

211220001330 is an abundant number, since it is smaller than the sum of its proper divisors (352795383246).

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

211220001330 is a wasteful number, since it uses less digits than its factorization.

211220001330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15012.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 211220001330 its reverse (33100022112), we get a palindrome (244320023442).

The spelling of 211220001330 in words is "two hundred eleven billion, two hundred twenty million, one thousand, three hundred thirty".