101221101019978 has 16 divisors (see below), whose sum is σ = 152483985029376. Its totient is φ = 50393107992160.

The previous prime is 101221101019967. The next prime is 101221101020009. The reversal of 101221101019978 is 879910101122101.

It is a super-2 number, since 2×101221101019978² (a number of 29 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152279175 + ... + 152942437.

It is an arithmetic number, because the mean of its divisors is an integer number (9530249064336).

Almost surely, 2^{101221101019978} is an apocalyptic number.

101221101019978 is a deficient number, since it is larger than the sum of its proper divisors (51262884009398).

101221101019978 is a wasteful number, since it uses less digits than its factorization.

101221101019978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990989.

The product of its (nonzero) digits is 18144, while the sum is 43.

The spelling of 101221101019978 in words is "one hundred one trillion, two hundred twenty-one billion, one hundred one million, nineteen thousand, nine hundred seventy-eight".