164020221420 has 96 divisors (see below), whose sum is σ = 505148023296. Its totient is φ = 39762458560.

The previous prime is 164020221419. The next prime is 164020221527. The reversal of 164020221420 is 24122020461.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 947064 + ... + 1106783.

It is an arithmetic number, because the mean of its divisors is an integer number (5261958576).

Almost surely, 2^164020221420 is an apocalyptic number.

164020221420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

164020221420 is an abundant number, since it is smaller than the sum of its proper divisors (341127801876).

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

164020221420 is a wasteful number, since it uses less digits than its factorization.

164020221420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2053892 (or 2053868 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 164020221420 its reverse (24122020461), we get a palindrome (188142241881).

The spelling of 164020221420 in words is "one hundred sixty-four billion, twenty million, two hundred twenty-one thousand, four hundred twenty".