155211021204 has 48 divisors (see below), whose sum is σ = 382929684480. Its totient is φ = 48794196960.

The previous prime is 155211021181. The next prime is 155211021283. The reversal of 155211021204 is 402120112551.

It is a happy number.

It is a super-2 number, since 2×155211021204² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1475502 + ... + 1577189.

It is an arithmetic number, because the mean of its divisors is an integer number (7977701760).

Almost surely, 2^155211021204 is an apocalyptic number.

It is an amenable number.

155211021204 is an abundant number, since it is smaller than the sum of its proper divisors (227718663276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155211021204 is a wasteful number, since it uses less digits than its factorization.

155211021204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3052940 (or 3052938 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 24.

Adding to 155211021204 its reverse (402120112551), we get a palindrome (557331133755).

The spelling of 155211021204 in words is "one hundred fifty-five billion, two hundred eleven million, twenty-one thousand, two hundred four".