1202120100 has 54 divisors (see below), whose sum is σ = 3767981490. Its totient is φ = 320565120.

The previous prime is 1202120089. The next prime is 1202120119. The reversal of 1202120100 is 10212021.

It can be written as a sum of positive squares in 3 ways, for example, as 665856 + 1201454244 = 816^2 + 34662^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 666945 + ... + 668744.

It is an arithmetic number, because the mean of its divisors is an integer number (69777435).

Almost surely, 2^1202120100 is an apocalyptic number.

1202120100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1202120100 is an abundant number, since it is smaller than the sum of its proper divisors (2565861390).

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

1202120100 is a wasteful number, since it uses less digits than its factorization.

1202120100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335709 (or 1335699 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 1202120100 is about 34671.6036548643. The cubic root of 1202120100 is about 1063.2840183320.

Adding to 1202120100 its reverse (10212021), we get a palindrome (1212332121).

The spelling of 1202120100 in words is "one billion, two hundred two million, one hundred twenty thousand, one hundred".