101221201988 has 6 divisors (see below), whose sum is σ = 177137103486. Its totient is φ = 50610600992.

The previous prime is 101221201943. The next prime is 101221202023. The reversal of 101221201988 is 889102122101.

It can be written as a sum of positive squares in only one way, i.e., 94391501824 + 6829700164 = 307232^2 + 82642^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12652650245 + ... + 12652650252.

It is an arithmetic number, because the mean of its divisors is an integer number (29522850581).

Almost surely, 2^101221201988 is an apocalyptic number.

It is an amenable number.

101221201988 is a deficient number, since it is larger than the sum of its proper divisors (75915901498).

101221201988 is a wasteful number, since it uses less digits than its factorization.

101221201988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25305300501 (or 25305300499 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The spelling of 101221201988 in words is "one hundred one billion, two hundred twenty-one million, two hundred one thousand, nine hundred eighty-eight".