1221556156070 has 16 divisors (see below), whose sum is σ = 2216114477568. Its totient is φ = 484775040960.

The previous prime is 1221556156069. The next prime is 1221556156127. The reversal of 1221556156070 is 706516551221.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 480926351 + ... + 480928890.

It is an arithmetic number, because the mean of its divisors is an integer number (138507154848).

Almost surely, 2^{1221556156070} is an apocalyptic number.

1221556156070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1221556156070 is a deficient number, since it is larger than the sum of its proper divisors (994558321498).

1221556156070 is a wasteful number, since it uses less digits than its factorization.

1221556156070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 961855375.

The product of its (nonzero) digits is 126000, while the sum is 41.

The spelling of 1221556156070 in words is "one trillion, two hundred twenty-one billion, five hundred fifty-six million, one hundred fifty-six thousand, seventy".