21301212321 has 12 divisors (see below), whose sum is σ = 31157892480. Its totient is φ = 14021050680.

The previous prime is 21301212271. The next prime is 21301212337. The reversal of 21301212321 is 12321210312.

21301212321 is a `hidden beast` number, since 2 + 130 + 1 + 212 + 321 = 666.

It is not a de Polignac number, because 21301212321 - 2⁷ = 21301212193 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301212294 and 21301212303.

It is not an unprimeable number, because it can be changed into a prime (21301212371) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14979045 + ... + 14980466.

It is an arithmetic number, because the mean of its divisors is an integer number (2596491040).

Almost surely, 2^21301212321 is an apocalyptic number.

It is an amenable number.

21301212321 is a deficient number, since it is larger than the sum of its proper divisors (9856680159).

21301212321 is a wasteful number, since it uses less digits than its factorization.

21301212321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29959596 (or 29959593 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21301212321 its reverse (12321210312), we get a palindrome (33622422633).

The spelling of 21301212321 in words is "twenty-one billion, three hundred one million, two hundred twelve thousand, three hundred twenty-one".