21122120201 has 16 divisors (see below), whose sum is σ = 26061982464. Its totient is φ = 16669882944.

The previous prime is 21122120197. The next prime is 21122120207. The reversal of 21122120201 is 10202122112.

It is not a de Polignac number, because 21122120201 - 2² = 21122120197 is a prime.

It is a super-2 number, since 2×21122120201² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21122120207) 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, 256205 + ... + 328458.

It is an arithmetic number, because the mean of its divisors is an integer number (1628873904).

Almost surely, 2^21122120201 is an apocalyptic number.

It is an amenable number.

21122120201 is a deficient number, since it is larger than the sum of its proper divisors (4939862263).

21122120201 is a wasteful number, since it uses less digits than its factorization.

21122120201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585080.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21122120201 its reverse (10202122112), we get a palindrome (31324242313).

The spelling of 21122120201 in words is "twenty-one billion, one hundred twenty-two million, one hundred twenty thousand, two hundred one".