161213420 has 12 divisors (see below), whose sum is σ = 338548224. Its totient is φ = 64485360.

The previous prime is 161213411. The next prime is 161213441. The reversal of 161213420 is 24312161.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 8060671 = 161213420 / (1 + 6 + 1 + 2 + 1 + 3 + 4 + 2 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 161213392 and 161213401.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4030316 + ... + 4030355.

It is an arithmetic number, because the mean of its divisors is an integer number (28212352).

Almost surely, 2^161213420 is an apocalyptic number.

161213420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161213420 is an abundant number, since it is smaller than the sum of its proper divisors (177334804).

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

161213420 is a wasteful number, since it uses less digits than its factorization.

161213420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8060680 (or 8060678 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 161213420 is about 12696.9846814116. The cubic root of 161213420 is about 544.2524554526.

Adding to 161213420 its reverse (24312161), we get a palindrome (185525581).

The spelling of 161213420 in words is "one hundred sixty-one million, two hundred thirteen thousand, four hundred twenty".