21020011000 has 32 divisors (see below), whose sum is σ = 49186828080. Its totient is φ = 8408004000.

The previous prime is 21020010971. The next prime is 21020011009. The reversal of 21020011000 is 11002012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020011009) 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, 10509006 + ... + 10511005.

Almost surely, 2^21020011000 is an apocalyptic number.

21020011000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21020011000 is an abundant number, since it is smaller than the sum of its proper divisors (28166817080).

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

21020011000 is a wasteful number, since it uses less digits than its factorization.

21020011000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21020032 (or 21020018 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21020011000 its reverse (11002012), we get a palindrome (21031013012).

The spelling of 21020011000 in words is "twenty-one billion, twenty million, eleven thousand".