101051521978 has 16 divisors (see below), whose sum is σ = 166347203904. Its totient is φ = 45657463360.

The previous prime is 101051521933. The next prime is 101051521993. The reversal of 101051521978 is 879125150101.

It is a super-2 number, since 2×101051521978² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 101051521978.

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, 13748575 + ... + 13755922.

It is an arithmetic number, because the mean of its divisors is an integer number (10396700244).

Almost surely, 2^101051521978 is an apocalyptic number.

101051521978 is a deficient number, since it is larger than the sum of its proper divisors (65295681926).

101051521978 is a wasteful number, since it uses less digits than its factorization.

101051521978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27504677.

The product of its (nonzero) digits is 25200, while the sum is 40.

The spelling of 101051521978 in words is "one hundred one billion, fifty-one million, five hundred twenty-one thousand, nine hundred seventy-eight".