21315014420 has 48 divisors (see below), whose sum is σ = 51230299008. Its totient is φ = 7297395840.

The previous prime is 21315014417. The next prime is 21315014423. The reversal of 21315014420 is 2441051312.

It is an interprime number because it is at equal distance from previous prime (21315014417) and next prime (21315014423).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21315014423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13427 + ... + 206906.

It is an arithmetic number, because the mean of its divisors is an integer number (1067297896).

Almost surely, 2^21315014420 is an apocalyptic number.

21315014420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21315014420 is an abundant number, since it is smaller than the sum of its proper divisors (29915284588).

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

21315014420 is a wasteful number, since it uses less digits than its factorization.

21315014420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221040 (or 221038 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21315014420 its reverse (2441051312), we get a palindrome (23756065732).

The spelling of 21315014420 in words is "twenty-one billion, three hundred fifteen million, fourteen thousand, four hundred twenty".