1211301020 has 24 divisors (see below), whose sum is σ = 2558443104. Its totient is φ = 481718336.

The previous prime is 1211301019. The next prime is 1211301023. The reversal of 1211301020 is 201031121.

It is a super-2 number, since 2×1211301020² = 2934500322106080800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1211300992 and 1211301010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211301023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171584 + ... + 178503.

It is an arithmetic number, because the mean of its divisors is an integer number (106601796).

Almost surely, 2^1211301020 is an apocalyptic number.

1211301020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1211301020 is an abundant number, since it is smaller than the sum of its proper divisors (1347142084).

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

1211301020 is a wasteful number, since it uses less digits than its factorization.

1211301020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 350269 (or 350267 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1211301020 is about 34803.7500852997. The cubic root of 1211301020 is about 1065.9840200264.

Adding to 1211301020 its reverse (201031121), we get a palindrome (1412332141).

The spelling of 1211301020 in words is "one billion, two hundred eleven million, three hundred one thousand, twenty".