21245414121 has 6 divisors (see below), whose sum is σ = 30687820410. Its totient is φ = 14163609408.

The previous prime is 21245414107. The next prime is 21245414159. The reversal of 21245414121 is 12141454212.

21245414121 is a `hidden beast` number, since 2 + 1 + 245 + 4 + 1 + 412 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 12129938496 + 9115475625 = 110136^2 + 95475^2 .

It is not a de Polignac number, because 21245414121 - 2¹⁴ = 21245397737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21245414161) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1180300776 + ... + 1180300793.

It is an arithmetic number, because the mean of its divisors is an integer number (5114636735).

Almost surely, 2^21245414121 is an apocalyptic number.

It is an amenable number.

21245414121 is a deficient number, since it is larger than the sum of its proper divisors (9442406289).

21245414121 is a wasteful number, since it uses less digits than its factorization.

21245414121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360601575 (or 2360601572 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

Adding to 21245414121 its reverse (12141454212), we get a palindrome (33386868333).

The spelling of 21245414121 in words is "twenty-one billion, two hundred forty-five million, four hundred fourteen thousand, one hundred twenty-one".