1621006021412 has 6 divisors (see below), whose sum is σ = 2836760537478. Its totient is φ = 810503010704.

The previous prime is 1621006021373. The next prime is 1621006021417. The reversal of 1621006021412 is 2141206001261.

It can be written as a sum of positive squares in only one way, i.e., 944111495716 + 676894525696 = 971654^2 + 822736^2 .

It is a super-2 number, since 2×1621006021412² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1621006021417) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202625752673 + ... + 202625752680.

It is an arithmetic number, because the mean of its divisors is an integer number (472793422913).

Almost surely, 2^{1621006021412} is an apocalyptic number.

It is an amenable number.

1621006021412 is a deficient number, since it is larger than the sum of its proper divisors (1215754516066).

1621006021412 is a wasteful number, since it uses less digits than its factorization.

1621006021412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405251505357 (or 405251505355 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The spelling of 1621006021412 in words is "one trillion, six hundred twenty-one billion, six million, twenty-one thousand, four hundred twelve".