2021123021099 has 16 divisors (see below), whose sum is σ = 2493280961472. Its totient is φ = 1595437129728.

The previous prime is 2021123021089. The next prime is 2021123021101. The reversal of 2021123021099 is 9901203211202.

It is a happy number.

It is not a de Polignac number, because 2021123021099 - 2⁸ = 2021123020843 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021123021089) 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, 25607414 + ... + 25686219.

It is an arithmetic number, because the mean of its divisors is an integer number (155830060092).

Almost surely, 2^{2021123021099} is an apocalyptic number.

2021123021099 is a deficient number, since it is larger than the sum of its proper divisors (472157940373).

2021123021099 is a wasteful number, since it uses less digits than its factorization.

2021123021099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51294086.

The product of its (nonzero) digits is 3888, while the sum is 32.

The spelling of 2021123021099 in words is "two trillion, twenty-one billion, one hundred twenty-three million, twenty-one thousand, ninety-nine".