90002121211 has 4 divisors (see below), whose sum is σ = 90893231424. Its totient is φ = 89111011000.

The previous prime is 90002121197. The next prime is 90002121217. The reversal of 90002121211 is 11212120009.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11212120009 = 191 ⋅58702199.

It is a cyclic number.

It is not a de Polignac number, because 90002121211 - 2¹⁵ = 90002088443 is a prime.

It is a super-2 number, since 2×90002121211² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90002121217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 445554955 + ... + 445555156.

It is an arithmetic number, because the mean of its divisors is an integer number (22723307856).

Almost surely, 2^90002121211 is an apocalyptic number.

90002121211 is a deficient number, since it is larger than the sum of its proper divisors (891110213).

90002121211 is a wasteful number, since it uses less digits than its factorization.

90002121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891110212.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 90002121211 in words is "ninety billion, two million, one hundred twenty-one thousand, two hundred eleven".