1211220987 has 16 divisors (see below), whose sum is σ = 1716798720. Its totient is φ = 757404000.

The previous prime is 1211220979. The next prime is 1211220991. The reversal of 1211220987 is 7890221121.

It is not a de Polignac number, because 1211220987 - 2³ = 1211220979 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1211220287) 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, 99439 + ... + 110952.

It is an arithmetic number, because the mean of its divisors is an integer number (107299920).

Almost surely, 2^1211220987 is an apocalyptic number.

1211220987 is a deficient number, since it is larger than the sum of its proper divisors (505577733).

1211220987 is a wasteful number, since it uses less digits than its factorization.

1211220987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210514.

The product of its (nonzero) digits is 4032, while the sum is 33.

The square root of 1211220987 is about 34802.6002907829. The cubic root of 1211220987 is about 1065.9605423010.

The spelling of 1211220987 in words is "one billion, two hundred eleven million, two hundred twenty thousand, nine hundred eighty-seven".