21032223121 has 16 divisors (see below), whose sum is σ = 25901620864. Its totient is φ = 16630717824.

The previous prime is 21032223103. The next prime is 21032223139. The reversal of 21032223121 is 12132223012.

It is an interprime number because it is at equal distance from previous prime (21032223103) and next prime (21032223139).

It is not a de Polignac number, because 21032223121 - 2⁷ = 21032222993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21032223151) 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, 81046 + ... + 220528.

It is an arithmetic number, because the mean of its divisors is an integer number (1618851304).

Almost surely, 2^21032223121 is an apocalyptic number.

It is an amenable number.

21032223121 is a deficient number, since it is larger than the sum of its proper divisors (4869397743).

21032223121 is a wasteful number, since it uses less digits than its factorization.

21032223121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141160.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21032223121 its reverse (12132223012), we get a palindrome (33164446133).

The spelling of 21032223121 in words is "twenty-one billion, thirty-two million, two hundred twenty-three thousand, one hundred twenty-one".