1121621421099 has 16 divisors (see below), whose sum is σ = 1522751005440. Its totient is φ = 734151532320.

The previous prime is 1121621421031. The next prime is 1121621421103. The reversal of 1121621421099 is 9901241261211.

It is not a de Polignac number, because 1121621421099 - 2¹⁶ = 1121621355563 is a prime.

It is a super-2 number, since 2×1121621421099² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1121621421499) 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, 3834367 + ... + 4116504.

It is an arithmetic number, because the mean of its divisors is an integer number (95171937840).

Almost surely, 2^{1121621421099} is an apocalyptic number.

1121621421099 is a deficient number, since it is larger than the sum of its proper divisors (401129584341).

1121621421099 is an equidigital number, since it uses as much as digits as its factorization.

1121621421099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7951730.

The product of its (nonzero) digits is 15552, while the sum is 39.

The spelling of 1121621421099 in words is "one trillion, one hundred twenty-one billion, six hundred twenty-one million, four hundred twenty-one thousand, ninety-nine".