101220000020 has 24 divisors (see below), whose sum is σ = 212598293544. Its totient is φ = 40481086976.

The previous prime is 101219999981. The next prime is 101220000031. The reversal of 101220000020 is 20000022101.

It can be written as a sum of positive squares in 4 ways, for example, as 27565296784 + 73654703236 = 166028^2 + 271394^2 .

It is a junction number, because it is equal to n+sod(n) for n = 101219999962 and 101220000007.

It is a congruent number.

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, 311177 + ... + 547056.

It is an arithmetic number, because the mean of its divisors is an integer number (8858262231).

Almost surely, 2^101220000020 is an apocalyptic number.

101220000020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101220000020 is an abundant number, since it is smaller than the sum of its proper divisors (111378293524).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101220000020 is a wasteful number, since it uses less digits than its factorization.

101220000020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 864139 (or 864137 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 101220000020 its reverse (20000022101), we get a palindrome (121220022121).

The spelling of 101220000020 in words is "one hundred one billion, two hundred twenty million, twenty", and thus it is an aban number.