21090129092 has 24 divisors (see below), whose sum is σ = 37684797696. Its totient is φ = 10323898208.

The previous prime is 21090129091. The next prime is 21090129101. The reversal of 21090129092 is 29092109012.

It is an alternating number because its digits alternate between even and odd.

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 7 ways as a sum of consecutive naturals, for example, 7508 + ... + 205515.

It is an arithmetic number, because the mean of its divisors is an integer number (1570199904).

Almost surely, 2^21090129092 is an apocalyptic number.

It is an amenable number.

21090129092 is a deficient number, since it is larger than the sum of its proper divisors (16594668604).

21090129092 is a wasteful number, since it uses less digits than its factorization.

21090129092 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 213547 (or 213545 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 35.

The spelling of 21090129092 in words is "twenty-one billion, ninety million, one hundred twenty-nine thousand, ninety-two".