101221101992 has 8 divisors (see below), whose sum is σ = 189789566250. Its totient is φ = 50610550992.

The previous prime is 101221101979. The next prime is 101221101997. The reversal of 101221101992 is 299101122101.

It can be written as a sum of positive squares in only one way, i.e., 65369194276 + 35851907716 = 255674^2 + 189346^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×101221101992² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (101221101997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6326318867 + ... + 6326318882.

Almost surely, 2^101221101992 is an apocalyptic number.

It is an amenable number.

101221101992 is a deficient number, since it is larger than the sum of its proper divisors (88568464258).

101221101992 is a wasteful number, since it uses less digits than its factorization.

101221101992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12652637755 (or 12652637751 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 29.

The spelling of 101221101992 in words is "one hundred one billion, two hundred twenty-one million, one hundred one thousand, nine hundred ninety-two".