1011211111020 has 72 divisors (see below), whose sum is σ = 3112190251632. Its totient is φ = 245142085760.

The previous prime is 1011211111019. The next prime is 1011211111067. The reversal of 1011211111020 is 201111121101.

It is a super-2 number, since 2×1011211111020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1011211110987 and 1011211111005.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69635379 + ... + 69649898.

It is an arithmetic number, because the mean of its divisors is an integer number (43224864606).

Almost surely, 2^{1011211111020} is an apocalyptic number.

1011211111020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011211111020 is an abundant number, since it is smaller than the sum of its proper divisors (2100979140612).

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

1011211111020 is a wasteful number, since it uses less digits than its factorization.

1011211111020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139285311 (or 139285298 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 1011211111020 its reverse (201111121101), we get a palindrome (1212322232121).

It can be divided in two parts, 101 and 1211111020, that added together give a palindrome (1211111121).

The spelling of 1011211111020 in words is "one trillion, eleven billion, two hundred eleven million, one hundred eleven thousand, twenty".