20321021000 has 64 divisors (see below), whose sum is σ = 54344234880. Its totient is φ = 6967204800.

The previous prime is 20321020991. The next prime is 20321021059. The reversal of 20321021000 is 12012302.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444502 + ... + 1458501.

It is an arithmetic number, because the mean of its divisors is an integer number (849128670).

Almost surely, 2^20321021000 is an apocalyptic number.

20321021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20321021000 is an abundant number, since it is smaller than the sum of its proper divisors (34023213880).

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

20321021000 is a wasteful number, since it uses less digits than its factorization.

20321021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2903031 (or 2903017 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20321021000 its reverse (12012302), we get a palindrome (20333033302).

The spelling of 20321021000 in words is "twenty billion, three hundred twenty-one million, twenty-one thousand".