101011221220 has 48 divisors (see below), whose sum is σ = 261075161088. Its totient is φ = 31968385920.

The previous prime is 101011221167. The next prime is 101011221281. The reversal of 101011221220 is 22122110101.

It is a super-3 number, since 3×101011221220³ (a number of 34 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 101011221220.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27748516 + ... + 27752155.

It is an arithmetic number, because the mean of its divisors is an integer number (5439065856).

Almost surely, 2^101011221220 is an apocalyptic number.

101011221220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

101011221220 is an abundant number, since it is smaller than the sum of its proper divisors (160063939868).

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

101011221220 is a wasteful number, since it uses less digits than its factorization.

101011221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55500700 (or 55500698 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 101011221220 its reverse (22122110101), we get a palindrome (123133331321).

It can be divided in two parts, 10101 and 1221220, that added together give a palindrome (1231321).

The spelling of 101011221220 in words is "one hundred one billion, eleven million, two hundred twenty-one thousand, two hundred twenty".