21121322001 has 16 divisors (see below), whose sum is σ = 30333890496. Its totient is φ = 12995234496.

The previous prime is 21121321987. The next prime is 21121322009. The reversal of 21121322001 is 10022312112.

It is not a de Polignac number, because 21121322001 - 2⁷ = 21121321873 is a prime.

It is a super-2 number, since 2×21121322001² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121322009) 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, 164451 + ... + 263223.

It is an arithmetic number, because the mean of its divisors is an integer number (1895868156).

Almost surely, 2^21121322001 is an apocalyptic number.

It is an amenable number.

21121322001 is a deficient number, since it is larger than the sum of its proper divisors (9212568495).

21121322001 is a wasteful number, since it uses less digits than its factorization.

21121322001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104272.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 21121322001 its reverse (10022312112), we get a palindrome (31143634113).

The spelling of 21121322001 in words is "twenty-one billion, one hundred twenty-one million, three hundred twenty-two thousand, one".