21090129093 has 48 divisors (see below), whose sum is σ = 36138937536. Its totient is φ = 11704849920.

The previous prime is 21090129091. The next prime is 21090129101. The reversal of 21090129093 is 39092109012.

It is a happy number.

It is not a de Polignac number, because 21090129093 - 2¹ = 21090129091 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21090129091) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 107071 + ... + 231612.

It is an arithmetic number, because the mean of its divisors is an integer number (752894532).

Almost surely, 2^21090129093 is an apocalyptic number.

It is an amenable number.

21090129093 is a deficient number, since it is larger than the sum of its proper divisors (15048808443).

21090129093 is a wasteful number, since it uses less digits than its factorization.

21090129093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338754 (or 338751 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The spelling of 21090129093 in words is "twenty-one billion, ninety million, one hundred twenty-nine thousand, ninety-three".