2121120001987 has 8 divisors (see below), whose sum is σ = 2424762437216. Its totient is φ = 1817633889792.

The previous prime is 2121120001951. The next prime is 2121120001993. The reversal of 2121120001987 is 7891000211212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2121120001987 - 2³⁵ = 2086760263619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2121120002987) 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, 39051678 + ... + 39105955.

It is an arithmetic number, because the mean of its divisors is an integer number (303095304652).

Almost surely, 2^{2121120001987} is an apocalyptic number.

2121120001987 is a deficient number, since it is larger than the sum of its proper divisors (303642435229).

2121120001987 is an equidigital number, since it uses as much as digits as its factorization.

2121120001987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78161517.

The product of its (nonzero) digits is 4032, while the sum is 34.

The spelling of 2121120001987 in words is "two trillion, one hundred twenty-one billion, one hundred twenty million, one thousand, nine hundred eighty-seven".