1213511020 has 12 divisors (see below), whose sum is σ = 2548373184. Its totient is φ = 485404400.

The previous prime is 1213510993. The next prime is 1213511023. The reversal of 1213511020 is 201153121.

It is a super-2 number, since 2×1213511020² = 2945217991322880800, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1213510985 and 1213511003.

It is not an unprimeable number, because it can be changed into a prime (1213511023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30337756 + ... + 30337795.

It is an arithmetic number, because the mean of its divisors is an integer number (212364432).

Almost surely, 2^1213511020 is an apocalyptic number.

1213511020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213511020 is an abundant number, since it is smaller than the sum of its proper divisors (1334862164).

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

1213511020 is a wasteful number, since it uses less digits than its factorization.

1213511020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60675560 (or 60675558 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1213511020 is about 34835.4850691073. The cubic root of 1213511020 is about 1066.6319166197.

Adding to 1213511020 its reverse (201153121), we get a palindrome (1414664141).

The spelling of 1213511020 in words is "one billion, two hundred thirteen million, five hundred eleven thousand, twenty".