2161267897020 has 24 divisors (see below), whose sum is σ = 6051550111824. Its totient is φ = 576338105856.

The previous prime is 2161267897007. The next prime is 2161267897021. The reversal of 2161267897020 is 207987621612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161267897021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18010565749 + ... + 18010565868.

It is an arithmetic number, because the mean of its divisors is an integer number (252147921326).

Almost surely, 2^{2161267897020} is an apocalyptic number.

2161267897020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2161267897020 is an abundant number, since it is smaller than the sum of its proper divisors (3890282214804).

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

2161267897020 is a wasteful number, since it uses less digits than its factorization.

2161267897020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36021131629 (or 36021131627 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 51.

The spelling of 2161267897020 in words is "two trillion, one hundred sixty-one billion, two hundred sixty-seven million, eight hundred ninety-seven thousand, twenty".