21001412423601 has 32 divisors (see below), whose sum is σ = 33000746380800. Its totient is φ = 13162797619920.

The previous prime is 21001412423599. The next prime is 21001412423711. The reversal of 21001412423601 is 10632421410012.

21001412423601 is a `hidden beast` number, since 2 + 1 + 0 + 0 + 1 + 4 + 12 + 42 + 3 + 601 = 666.

It is not a de Polignac number, because 21001412423601 - 2¹ = 21001412423599 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21001412423501) 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, 156186331 + ... + 156320736.

It is an arithmetic number, because the mean of its divisors is an integer number (1031273324400).

Almost surely, 2^{21001412423601} is an apocalyptic number.

It is an amenable number.

21001412423601 is a deficient number, since it is larger than the sum of its proper divisors (11999333957199).

21001412423601 is a wasteful number, since it uses less digits than its factorization.

21001412423601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312507226 (or 312507220 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

Adding to 21001412423601 its reverse (10632421410012), we get a palindrome (31633833833613).

The spelling of 21001412423601 in words is "twenty-one trillion, one billion, four hundred twelve million, four hundred twenty-three thousand, six hundred one".