161121501026212 has 6 divisors (see below), whose sum is σ = 281962626795878. Its totient is φ = 80560750513104.

The previous prime is 161121501026179. The next prime is 161121501026221. The reversal of 161121501026212 is 212620105121161.

It can be written as a sum of positive squares in only one way, i.e., 98809643612416 + 62311857413796 = 9940304^2 + 7893786^2 .

It is a super-2 number, since 2×161121501026212² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20140187628273 + ... + 20140187628280.

Almost surely, 2^{161121501026212} is an apocalyptic number.

It is an amenable number.

161121501026212 is a deficient number, since it is larger than the sum of its proper divisors (120841125769666).

161121501026212 is a wasteful number, since it uses less digits than its factorization.

161121501026212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40280375256557 (or 40280375256555 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 31.

Adding to 161121501026212 its reverse (212620105121161), we get a palindrome (373741606147373).

The spelling of 161121501026212 in words is "one hundred sixty-one trillion, one hundred twenty-one billion, five hundred one million, twenty-six thousand, two hundred twelve".