90120212002 has 4 divisors (see below), whose sum is σ = 135180318006. Its totient is φ = 45060106000.

The previous prime is 90120211999. The next prime is 90120212033. The reversal of 90120212002 is 20021202109.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87385863321 + 2734348681 = 295611^2 + 52291^2 .

It is a super-2 number, since 2×90120212002² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22530052999 + ... + 22530053002.

Almost surely, 2^90120212002 is an apocalyptic number.

90120212002 is a deficient number, since it is larger than the sum of its proper divisors (45060106004).

90120212002 is a wasteful number, since it uses less digits than its factorization.

90120212002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45060106003.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 90120212002 in words is "ninety billion, one hundred twenty million, two hundred twelve thousand, two".