21032123012 has 12 divisors (see below), whose sum is σ = 37053237900. Its totient is φ = 10445483616.

The previous prime is 21032122997. The next prime is 21032123027.

21032123012 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (21032122997) and next prime (21032123027).

It can be written as a sum of positive squares in 2 ways, for example, as 9084758596 + 11947364416 = 95314^2 + 109304^2 .

It is an alternating number because its digits alternate between even and odd.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17643803 + ... + 17644994.

It is an arithmetic number, because the mean of its divisors is an integer number (3087769825).

Almost surely, 2^21032123012 is an apocalyptic number.

It is an amenable number.

21032123012 is a deficient number, since it is larger than the sum of its proper divisors (16021114888).

21032123012 is a wasteful number, since it uses less digits than its factorization.

21032123012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35288950 (or 35288948 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The spelling of 21032123012 in words is "twenty-one billion, thirty-two million, one hundred twenty-three thousand, twelve".