1208998998021 has 32 divisors (see below), whose sum is σ = 1696948273152. Its totient is φ = 764169215040.

The previous prime is 1208998997993. The next prime is 1208998998029.

1208998998021 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1208998998021 - 2¹⁴ = 1208998981637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1208998998029) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4051036 + ... + 4339226.

It is an arithmetic number, because the mean of its divisors is an integer number (53029633536).

Almost surely, 2^{1208998998021} is an apocalyptic number.

It is an amenable number.

1208998998021 is a deficient number, since it is larger than the sum of its proper divisors (487949275131).

1208998998021 is a wasteful number, since it uses less digits than its factorization.

1208998998021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288753.

The product of its (nonzero) digits is 13436928, while the sum is 66.

The spelling of 1208998998021 in words is "one trillion, two hundred eight billion, nine hundred ninety-eight million, nine hundred ninety-eight thousand, twenty-one".