21011022211201 has 4 divisors (see below), whose sum is σ = 22921115139504. Its totient is φ = 19100929282900.

The previous prime is 21011022211169. The next prime is 21011022211219. The reversal of 21011022211201 is 10211222011012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21011022211201 - 2⁵ = 21011022211169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21011022211261) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 955046464135 + ... + 955046464156.

It is an arithmetic number, because the mean of its divisors is an integer number (5730278784876).

Almost surely, 2^{21011022211201} is an apocalyptic number.

It is an amenable number.

21011022211201 is a deficient number, since it is larger than the sum of its proper divisors (1910092928303).

21011022211201 is a wasteful number, since it uses less digits than its factorization.

21011022211201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910092928302.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21011022211201 its reverse (10211222011012), we get a palindrome (31222244222213).

The spelling of 21011022211201 in words is "twenty-one trillion, eleven billion, twenty-two million, two hundred eleven thousand, two hundred one".