2001012021992 has 16 divisors (see below), whose sum is σ = 3752705687040. Its totient is φ = 1000290505456.

The previous prime is 2001012021991. The next prime is 2001012022007. The reversal of 2001012021992 is 2991202101002.

It is a super-2 number, since 2×2001012021992² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001012021991) 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, 26898728 + ... + 26973015.

It is an arithmetic number, because the mean of its divisors is an integer number (234544105440).

Almost surely, 2^{2001012021992} is an apocalyptic number.

It is an amenable number.

2001012021992 is a deficient number, since it is larger than the sum of its proper divisors (1751693665048).

2001012021992 is a wasteful number, since it uses less digits than its factorization.

2001012021992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53876392 (or 53876388 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 29.

Adding to 2001012021992 its reverse (2991202101002), we get a palindrome (4992214122994).

The spelling of 2001012021992 in words is "two trillion, one billion, twelve million, twenty-one thousand, nine hundred ninety-two".