21221012123001 has 16 divisors (see below), whose sum is σ = 31438615629120. Its totient is φ = 14147305797600.

The previous prime is 21221012122969. The next prime is 21221012123033. The reversal of 21221012123001 is 10032121012212.

21221012123001 is a `hidden beast` number, since 21 + 221 + 0 + 121 + 2 + 300 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (21221012122969) and next prime (21221012123033).

It is not a de Polignac number, because 21221012123001 - 2⁵ = 21221012122969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21221012123041) 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, 14140101 + ... + 15568701.

It is an arithmetic number, because the mean of its divisors is an integer number (1964913476820).

Almost surely, 2^{21221012123001} is an apocalyptic number.

It is an amenable number.

21221012123001 is a deficient number, since it is larger than the sum of its proper divisors (10217603506119).

21221012123001 is a wasteful number, since it uses less digits than its factorization.

21221012123001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1978773 (or 1978767 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

Adding to 21221012123001 its reverse (10032121012212), we get a palindrome (31253133135213).

The spelling of 21221012123001 in words is "twenty-one trillion, two hundred twenty-one billion, twelve million, one hundred twenty-three thousand, one".