1011201020 has 24 divisors (see below), whose sum is σ = 2127765024. Its totient is φ = 403672256.

The previous prime is 1011201019. The next prime is 1011201077. The reversal of 1011201020 is 201021101.

It is a junction number, because it is equal to n+sod(n) for n = 1011200989 and 1011201007.

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, 40199 + ... + 60318.

It is an arithmetic number, because the mean of its divisors is an integer number (88656876).

Almost surely, 2^1011201020 is an apocalyptic number.

1011201020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1011201020 is an abundant number, since it is smaller than the sum of its proper divisors (1116564004).

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

1011201020 is a wasteful number, since it uses less digits than its factorization.

1011201020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101029 (or 101027 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1011201020 is about 31799.3871010119. The cubic root of 1011201020 is about 1003.7198191219.

Adding to 1011201020 its reverse (201021101), we get a palindrome (1212222121).

The spelling of 1011201020 in words is "one billion, eleven million, two hundred one thousand, twenty".