21301121020 has 12 divisors (see below), whose sum is σ = 44732354184. Its totient is φ = 8520448400.

The previous prime is 21301120961. The next prime is 21301121021. The reversal of 21301121020 is 2012110312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21301121021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532528006 + ... + 532528045.

It is an arithmetic number, because the mean of its divisors is an integer number (3727696182).

Almost surely, 2^21301121020 is an apocalyptic number.

21301121020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21301121020 is an abundant number, since it is smaller than the sum of its proper divisors (23431233164).

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

21301121020 is a wasteful number, since it uses less digits than its factorization.

21301121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065056060 (or 1065056058 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21301121020 its reverse (2012110312), we get a palindrome (23313231332).

The spelling of 21301121020 in words is "twenty-one billion, three hundred one million, one hundred twenty-one thousand, twenty".