21130212021 has 8 divisors (see below), whose sum is σ = 28187111040. Its totient is φ = 14080060512.

The previous prime is 21130212017. The next prime is 21130212023. The reversal of 21130212021 is 12021203112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21130212021 - 2² = 21130212017 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21130212023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1679565 + ... + 1692098.

It is an arithmetic number, because the mean of its divisors is an integer number (3523388880).

Almost surely, 2^21130212021 is an apocalyptic number.

It is an amenable number.

21130212021 is a deficient number, since it is larger than the sum of its proper divisors (7056899019).

21130212021 is a wasteful number, since it uses less digits than its factorization.

21130212021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3373755.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21130212021 its reverse (12021203112), we get a palindrome (33151415133).

The spelling of 21130212021 in words is "twenty-one billion, one hundred thirty million, two hundred twelve thousand, twenty-one".