161034221400 has 96 divisors (see below), whose sum is σ = 537606580560. Its totient is φ = 39639191040.

The previous prime is 161034221389. The next prime is 161034221443. The reversal of 161034221400 is 4122430161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10314907 + ... + 10330506.

Almost surely, 2^161034221400 is an apocalyptic number.

161034221400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161034221400 is an abundant number, since it is smaller than the sum of its proper divisors (376572359160).

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

161034221400 is a wasteful number, since it uses less digits than its factorization.

161034221400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20645445 (or 20645436 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Adding to 161034221400 its reverse (4122430161), we get a palindrome (165156651561).

The spelling of 161034221400 in words is "one hundred sixty-one billion, thirty-four million, two hundred twenty-one thousand, four hundred".