101221209999 has 96 divisors (see below), whose sum is σ = 181460872320. Its totient is φ = 53259628032.

The previous prime is 101221209967. The next prime is 101221210007. The reversal of 101221209999 is 999902122101.

It is not a de Polignac number, because 101221209999 - 2⁵ = 101221209967 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101221209499) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 84845347 + ... + 84846539.

It is an arithmetic number, because the mean of its divisors is an integer number (1890217420).

Almost surely, 2^101221209999 is an apocalyptic number.

101221209999 is a deficient number, since it is larger than the sum of its proper divisors (80239662321).

101221209999 is a wasteful number, since it uses less digits than its factorization.

101221209999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1829 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The spelling of 101221209999 in words is "one hundred one billion, two hundred twenty-one million, two hundred nine thousand, nine hundred ninety-nine".