1211010020 has 48 divisors (see below), whose sum is σ = 2783930688. Its totient is φ = 438840960.

The previous prime is 1211009951. The next prime is 1211010029. The reversal of 1211010020 is 200101121.

It is not an unprimeable number, because it can be changed into a prime (1211010029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55067 + ... + 73853.

It is an arithmetic number, because the mean of its divisors is an integer number (57998556).

Almost surely, 2^1211010020 is an apocalyptic number.

1211010020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1211010020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391965344).

1211010020 is an abundant number, since it is smaller than the sum of its proper divisors (1572920668).

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

1211010020 is a wasteful number, since it uses less digits than its factorization.

1211010020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19100 (or 19098 counting only the distinct ones).

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

The square root of 1211010020 is about 34799.5692502077. The cubic root of 1211010020 is about 1065.8986500568.

Adding to 1211010020 its reverse (200101121), we get a palindrome (1411111141).

The spelling of 1211010020 in words is "one billion, two hundred eleven million, ten thousand, twenty".