55422121 has 2 divisors, whose sum is σ = 55422122. Its totient is φ = 55422120.

The previous prime is 55422113. The next prime is 55422127. The reversal of 55422121 is 12122455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35521600 + 19900521 = 5960^2 + 4461^2 .

It is a cyclic number.

It is not a de Polignac number, because 55422121 - 2³ = 55422113 is a prime.

It is a super-2 number, since 2×55422121² = 6143222992277282, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55422092 and 55422101.

It is not a weakly prime, because it can be changed into another prime (55422127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27711060 + 27711061.

It is an arithmetic number, because the mean of its divisors is an integer number (27711061).

Almost surely, 2^55422121 is an apocalyptic number.

It is an amenable number.

55422121 is a deficient number, since it is larger than the sum of its proper divisors (1).

55422121 is an equidigital number, since it uses as much as digits as its factorization.

55422121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 800, while the sum is 22.

The square root of 55422121 is about 7444.6034817175. The cubic root of 55422121 is about 381.2656804086.

Adding to 55422121 its reverse (12122455), we get a palindrome (67544576).

The spelling of 55422121 in words is "fifty-five million, four hundred twenty-two thousand, one hundred twenty-one".