21001131032 has 32 divisors (see below), whose sum is σ = 46218709920. Its totient is φ = 8757227520.

The previous prime is 21001131031. The next prime is 21001131049. The reversal of 21001131032 is 23013110012.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 21001130998 and 21001131016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001131031) 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, 5065769 + ... + 5069912.

It is an arithmetic number, because the mean of its divisors is an integer number (1444334685).

Almost surely, 2^21001131032 is an apocalyptic number.

It is an amenable number.

21001131032 is an abundant number, since it is smaller than the sum of its proper divisors (25217578888).

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

21001131032 is a wasteful number, since it uses less digits than its factorization.

21001131032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10135731 (or 10135727 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

Adding to 21001131032 its reverse (23013110012), we get a palindrome (44014241044).

The spelling of 21001131032 in words is "twenty-one billion, one million, one hundred thirty-one thousand, thirty-two".