221201154012 has 48 divisors (see below), whose sum is σ = 530793401600. Its totient is φ = 71657042688.

The previous prime is 221201153983. The next prime is 221201154037. The reversal of 221201154012 is 210451102122.

It is a super-2 number, since 2×221201154012² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 221201154012.

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, 974413 + ... + 1179780.

Almost surely, 2^221201154012 is an apocalyptic number.

It is an amenable number.

221201154012 is an abundant number, since it is smaller than the sum of its proper divisors (309592247588).

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

221201154012 is a wasteful number, since it uses less digits than its factorization.

221201154012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2154442 (or 2154440 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

Adding to 221201154012 its reverse (210451102122), we get a palindrome (431652256134).

The spelling of 221201154012 in words is "two hundred twenty-one billion, two hundred one million, one hundred fifty-four thousand, twelve".