1187489680421 has 12 divisors (see below), whose sum is σ = 1305303589632. Its totient is φ = 1079497749000.

The previous prime is 1187489680409. The next prime is 1187489680423. The reversal of 1187489680421 is 1240869847811.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-1187489680421 is a prime.

It is a super-2 number, since 2×1187489680421² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1187489680423) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3581486 + ... + 3898976.

It is an arithmetic number, because the mean of its divisors is an integer number (108775299136).

Almost surely, 2^{1187489680421} is an apocalyptic number.

1187489680421 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1187489680421 is a deficient number, since it is larger than the sum of its proper divisors (117813909211).

1187489680421 is a wasteful number, since it uses less digits than its factorization.

1187489680421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 348424 (or 348413 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 59.

The spelling of 1187489680421 in words is "one trillion, one hundred eighty-seven billion, four hundred eighty-nine million, six hundred eighty thousand, four hundred twenty-one".