2211021023551 has 4 divisors (see below), whose sum is σ = 2215796447392. Its totient is φ = 2206245599712.

The previous prime is 2211021023537. The next prime is 2211021023609. The reversal of 2211021023551 is 1553201201122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2211021023551 is a prime.

It is a super-2 number, since 2×2211021023551² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211021023521) 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, 2387711226 + ... + 2387712151.

It is an arithmetic number, because the mean of its divisors is an integer number (553949111848).

Almost surely, 2^{2211021023551} is an apocalyptic number.

2211021023551 is a deficient number, since it is larger than the sum of its proper divisors (4775423841).

2211021023551 is an equidigital number, since it uses as much as digits as its factorization.

2211021023551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775423840.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 2211021023551 its reverse (1553201201122), we get a palindrome (3764222224673).

The spelling of 2211021023551 in words is "two trillion, two hundred eleven billion, twenty-one million, twenty-three thousand, five hundred fifty-one".