201521154068 has 12 divisors (see below), whose sum is σ = 379789867380. Its totient is φ = 93009763392.

The previous prime is 201521154067. The next prime is 201521154071. The reversal of 201521154068 is 860451125102.

It can be written as a sum of positive squares in 2 ways, for example, as 46523038864 + 154998115204 = 215692^2 + 393698^2 .

It is a super-2 number, since 2×201521154068² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201521154067) 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, 1937703353 + ... + 1937703456.

It is an arithmetic number, because the mean of its divisors is an integer number (31649155615).

Almost surely, 2^201521154068 is an apocalyptic number.

It is an amenable number.

201521154068 is a deficient number, since it is larger than the sum of its proper divisors (178268713312).

201521154068 is a wasteful number, since it uses less digits than its factorization.

201521154068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3875406826 (or 3875406824 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The spelling of 201521154068 in words is "two hundred one billion, five hundred twenty-one million, one hundred fifty-four thousand, sixty-eight".