155212400122 has 32 divisors (see below), whose sum is σ = 252161965440. Its totient is φ = 71227840320.

The previous prime is 155212400117. The next prime is 155212400131. The reversal of 155212400122 is 221004212551.

It is a super-2 number, since 2×155212400122² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321097 + ... + 3367507.

It is an arithmetic number, because the mean of its divisors is an integer number (7880061420).

Almost surely, 2^155212400122 is an apocalyptic number.

155212400122 is a deficient number, since it is larger than the sum of its proper divisors (96949565318).

155212400122 is a wasteful number, since it uses less digits than its factorization.

155212400122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47158.

The product of its (nonzero) digits is 1600, while the sum is 25.

Adding to 155212400122 its reverse (221004212551), we get a palindrome (376216612673).

The spelling of 155212400122 in words is "one hundred fifty-five billion, two hundred twelve million, four hundred thousand, one hundred twenty-two".