1209920911002 has 48 divisors (see below), whose sum is σ = 2736102875688. Its totient is φ = 386046236160.

The previous prime is 1209920910973. The next prime is 1209920911007. The reversal of 1209920911002 is 2001190299021.

It can be written as a sum of positive squares in 4 ways, for example, as 880859208681 + 329061702321 = 938541^2 + 573639^2 .

It is a super-2 number, since 2×1209920911002² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1209920911007) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15427483 + ... + 15505710.

Almost surely, 2^{1209920911002} is an apocalyptic number.

1209920911002 is an abundant number, since it is smaller than the sum of its proper divisors (1526181964686).

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

1209920911002 is a wasteful number, since it uses less digits than its factorization.

1209920911002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30933295 (or 30933292 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The spelling of 1209920911002 in words is "one trillion, two hundred nine billion, nine hundred twenty million, nine hundred eleven thousand, two".