21002032122 has 32 divisors (see below), whose sum is σ = 42647606784. Its totient is φ = 6893502000.

The previous prime is 21002032111. The next prime is 21002032127. The reversal of 21002032122 is 22123020012.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21002032127) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1201747 + ... + 1219097.

It is an arithmetic number, because the mean of its divisors is an integer number (1332737712).

Almost surely, 2^21002032122 is an apocalyptic number.

21002032122 is an abundant number, since it is smaller than the sum of its proper divisors (21645574662).

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

21002032122 is a wasteful number, since it uses less digits than its factorization.

21002032122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20434.

The product of its (nonzero) digits is 96, while the sum is 15.

Adding to 21002032122 its reverse (22123020012), we get a palindrome (43125052134).

The spelling of 21002032122 in words is "twenty-one billion, two million, thirty-two thousand, one hundred twenty-two".