21103434021090 has 32 divisors (see below), whose sum is σ = 50661387072576. Its totient is φ = 5626121803200.

The previous prime is 21103434021029. The next prime is 21103434021091. The reversal of 21103434021090 is 9012043430112.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (21103434021091) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 91170136 + ... + 91401315.

It is an arithmetic number, because the mean of its divisors is an integer number (1583168346018).

Almost surely, 2^{21103434021090} is an apocalyptic number.

21103434021090 is an abundant number, since it is smaller than the sum of its proper divisors (29557953051486).

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

21103434021090 is a wasteful number, since it uses less digits than its factorization.

21103434021090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182575314.

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 21103434021090 in words is "twenty-one trillion, one hundred three billion, four hundred thirty-four million, twenty-one thousand, ninety".