21021231021320 has 32 divisors (see below), whose sum is σ = 47299111833600. Its totient is φ = 8408253824448.

The previous prime is 21021231021277. The next prime is 21021231021337. The reversal of 21021231021320 is 2312013212012.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 21021231021292 and 21021231021301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6025010 + ... + 8851169.

It is an arithmetic number, because the mean of its divisors is an integer number (1478097244800).

Almost surely, 2^{21021231021320} is an apocalyptic number.

21021231021320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21021231021320 is an abundant number, since it is smaller than the sum of its proper divisors (26277880812280).

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

21021231021320 is a wasteful number, since it uses less digits than its factorization.

21021231021320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14911517 (or 14911513 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 21021231021320 its reverse (2312013212012), we get a palindrome (23333244233332).

The spelling of 21021231021320 in words is "twenty-one trillion, twenty-one billion, two hundred thirty-one million, twenty-one thousand, three hundred twenty".