21034025121 has 8 divisors (see below), whose sum is σ = 28055215264. Its totient is φ = 14017759200.

The previous prime is 21034025101. The next prime is 21034025141. The reversal of 21034025121 is 12152043012.

It is an interprime number because it is at equal distance from previous prime (21034025101) and next prime (21034025141).

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

It is not a de Polignac number, because 21034025121 - 2⁶ = 21034025057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034025101) 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, 1221076 + ... + 1238181.

It is an arithmetic number, because the mean of its divisors is an integer number (3506901908).

Almost surely, 2^21034025121 is an apocalyptic number.

It is an amenable number.

21034025121 is a deficient number, since it is larger than the sum of its proper divisors (7021190143).

21034025121 is a wasteful number, since it uses less digits than its factorization.

21034025121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2462111.

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

Adding to 21034025121 its reverse (12152043012), we get a palindrome (33186068133).

The spelling of 21034025121 in words is "twenty-one billion, thirty-four million, twenty-five thousand, one hundred twenty-one".