21251065001001 has 32 divisors (see below), whose sum is σ = 31778871094656. Its totient is φ = 12519938496000.

The previous prime is 21251065000973. The next prime is 21251065001017. The reversal of 21251065001001 is 10010056015212.

It is not a de Polignac number, because 21251065001001 - 2¹¹ = 21251064998953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21251065001041) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27976530 + ... + 28726091.

It is an arithmetic number, because the mean of its divisors is an integer number (993089721708).

Almost surely, 2^{21251065001001} is an apocalyptic number.

It is an amenable number.

21251065001001 is a deficient number, since it is larger than the sum of its proper divisors (10527806093655).

21251065001001 is a wasteful number, since it uses less digits than its factorization.

21251065001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56702953.

The product of its (nonzero) digits is 600, while the sum is 24.

The spelling of 21251065001001 in words is "twenty-one trillion, two hundred fifty-one billion, sixty-five million, one thousand, one".