1210201720 has 64 divisors (see below), whose sum is σ = 3351337920. Its totient is φ = 383007744.

The previous prime is 1210201583. The next prime is 1210201721. The reversal of 1210201720 is 271020121.

It is a junction number, because it is equal to n+sod(n) for n = 1210201694 and 1210201703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210201721) 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, 162597 + ... + 169876.

It is an arithmetic number, because the mean of its divisors is an integer number (52364655).

Almost surely, 2^1210201720 is an apocalyptic number.

1210201720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210201720 is an abundant number, since it is smaller than the sum of its proper divisors (2141136200).

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

1210201720 is a wasteful number, since it uses less digits than its factorization.

1210201720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332504 (or 332500 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 16.

The square root of 1210201720 is about 34787.9536621515. The cubic root of 1210201720 is about 1065.6614492568.

Adding to 1210201720 its reverse (271020121), we get a palindrome (1481221841).

The spelling of 1210201720 in words is "one billion, two hundred ten million, two hundred one thousand, seven hundred twenty".