213221221040 has 40 divisors (see below), whose sum is σ = 497210438400. Its totient is φ = 85035396096.

The previous prime is 213221221009. The next prime is 213221221063. The reversal of 213221221040 is 40122122312.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-3 number, since 3×213221221040³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

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, 3927440 + ... + 3981359.

It is an arithmetic number, because the mean of its divisors is an integer number (12430260960).

Almost surely, 2^213221221040 is an apocalyptic number.

213221221040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213221221040 is an abundant number, since it is smaller than the sum of its proper divisors (283989217360).

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

213221221040 is a wasteful number, since it uses less digits than its factorization.

213221221040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7909149 (or 7909143 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

Adding to 213221221040 its reverse (40122122312), we get a palindrome (253343343352).

The spelling of 213221221040 in words is "two hundred thirteen billion, two hundred twenty-one million, two hundred twenty-one thousand, forty".