21421300215 has 64 divisors (see below), whose sum is σ = 40682373120. Its totient is φ = 9421668480.

The previous prime is 21421300213. The next prime is 21421300223. The reversal of 21421300215 is 51200312412.

It is not a de Polignac number, because 21421300215 - 2¹ = 21421300213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 21421300191 and 21421300200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21421300213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 254380 + ... + 327950.

It is an arithmetic number, because the mean of its divisors is an integer number (635662080).

Almost surely, 2^21421300215 is an apocalyptic number.

21421300215 is a deficient number, since it is larger than the sum of its proper divisors (19261072905).

21421300215 is a wasteful number, since it uses less digits than its factorization.

21421300215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73692.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21421300215 its reverse (51200312412), we get a palindrome (72621612627).

The spelling of 21421300215 in words is "twenty-one billion, four hundred twenty-one million, three hundred thousand, two hundred fifteen".