21122240377 has 4 divisors (see below), whose sum is σ = 24139703296. Its totient is φ = 18104777460.

The previous prime is 21122240311. The next prime is 21122240429. The reversal of 21122240377 is 77304222112.

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 not a de Polignac number, because 21122240377 - 2¹¹ = 21122238329 is a prime.

It is a super-2 number, since 2×21122240377² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21122240677) 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, 1508731449 + ... + 1508731462.

It is an arithmetic number, because the mean of its divisors is an integer number (6034925824).

Almost surely, 2^21122240377 is an apocalyptic number.

It is an amenable number.

21122240377 is a deficient number, since it is larger than the sum of its proper divisors (3017462919).

21122240377 is an equidigital number, since it uses as much as digits as its factorization.

21122240377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3017462918.

The product of its (nonzero) digits is 9408, while the sum is 31.

Adding to 21122240377 its reverse (77304222112), we get a palindrome (98426462489).

The spelling of 21122240377 in words is "twenty-one billion, one hundred twenty-two million, two hundred forty thousand, three hundred seventy-seven".