21411420121 has 16 divisors (see below), whose sum is σ = 26358970624. Its totient is φ = 16936755264.

The previous prime is 21411420103. The next prime is 21411420133. The reversal of 21411420121 is 12102411412.

It is a happy number.

It is not a de Polignac number, because 21411420121 - 2⁵ = 21411420089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21411420161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 375895 + ... + 429091.

It is an arithmetic number, because the mean of its divisors is an integer number (1647435664).

Almost surely, 2^21411420121 is an apocalyptic number.

It is an amenable number.

21411420121 is a deficient number, since it is larger than the sum of its proper divisors (4947550503).

21411420121 is a wasteful number, since it uses less digits than its factorization.

21411420121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57640.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 21411420121 its reverse (12102411412), we get a palindrome (33513831533).

The spelling of 21411420121 in words is "twenty-one billion, four hundred eleven million, four hundred twenty thousand, one hundred twenty-one".