1921201892281 has 16 divisors (see below), whose sum is σ = 2197065378816. Its totient is φ = 1645690240656.

The previous prime is 1921201892263. The next prime is 1921201892287. The reversal of 1921201892281 is 1822981021291.

It is a happy number.

It is not a de Polignac number, because 1921201892281 - 2²⁵ = 1921168337849 is a prime.

It is a super-2 number, since 2×1921201892281² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1921201892287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113089870 + ... + 113106856.

It is an arithmetic number, because the mean of its divisors is an integer number (137316586176).

Almost surely, 2^{1921201892281} is an apocalyptic number.

It is an amenable number.

1921201892281 is a deficient number, since it is larger than the sum of its proper divisors (275863486535).

1921201892281 is a wasteful number, since it uses less digits than its factorization.

1921201892281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26388.

The product of its (nonzero) digits is 82944, while the sum is 46.

The spelling of 1921201892281 in words is "one trillion, nine hundred twenty-one billion, two hundred one million, eight hundred ninety-two thousand, two hundred eighty-one".