90148887221 has 4 divisors (see below), whose sum is σ = 90576133344. Its totient is φ = 89721641100.

The previous prime is 90148887217. The next prime is 90148887233. The reversal of 90148887221 is 12278884109.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12278884109 = 67 ⋅183266927.

It is a cyclic number.

It is not a de Polignac number, because 90148887221 - 2² = 90148887217 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90148887221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90148887721) 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, 213622745 + ... + 213623166.

It is an arithmetic number, because the mean of its divisors is an integer number (22644033336).

Almost surely, 2^90148887221 is an apocalyptic number.

It is an amenable number.

90148887221 is a deficient number, since it is larger than the sum of its proper divisors (427246123).

90148887221 is a wasteful number, since it uses less digits than its factorization.

90148887221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427246122.

The product of its (nonzero) digits is 516096, while the sum is 50.

The spelling of 90148887221 in words is "ninety billion, one hundred forty-eight million, eight hundred eighty-seven thousand, two hundred twenty-one".