201212155020 has 96 divisors (see below), whose sum is σ = 568596833280. Its totient is φ = 53161436160.

The previous prime is 201212155009. The next prime is 201212155051. The reversal of 201212155020 is 20551212102.

It is a super-2 number, since 2×201212155020² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27868971 + ... + 27876189.

It is an arithmetic number, because the mean of its divisors is an integer number (5922883680).

Almost surely, 2^201212155020 is an apocalyptic number.

201212155020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 201212155020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (284298416640).

201212155020 is an abundant number, since it is smaller than the sum of its proper divisors (367384678260).

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

201212155020 is a wasteful number, since it uses less digits than its factorization.

201212155020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11455 (or 11453 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 21.

Adding to 201212155020 its reverse (20551212102), we get a palindrome (221763367122).

The spelling of 201212155020 in words is "two hundred one billion, two hundred twelve million, one hundred fifty-five thousand, twenty".