90010101221 has 8 divisors (see below), whose sum is σ = 91023709824. Its totient is φ = 88998893200.

The previous prime is 90010101217. The next prime is 90010101257. The reversal of 90010101221 is 12210101009.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 90010101221 - 2² = 90010101217 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 90010101221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90010101121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 524681 + ... + 674766.

It is an arithmetic number, because the mean of its divisors is an integer number (11377963728).

Almost surely, 2^90010101221 is an apocalyptic number.

It is an amenable number.

90010101221 is a deficient number, since it is larger than the sum of its proper divisors (1013608603).

90010101221 is a wasteful number, since it uses less digits than its factorization.

90010101221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1200291.

The product of its (nonzero) digits is 36, while the sum is 17.

The spelling of 90010101221 in words is "ninety billion, ten million, one hundred one thousand, two hundred twenty-one".