1221073854 has 64 divisors (see below), whose sum is σ = 3278983680. Its totient is φ = 292763520.

The previous prime is 1221073831. The next prime is 1221073877. The reversal of 1221073854 is 4583701221.

It is an interprime number because it is at equal distance from previous prime (1221073831) and next prime (1221073877).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95649 + ... + 107660.

It is an arithmetic number, because the mean of its divisors is an integer number (51234120).

Almost surely, 2^1221073854 is an apocalyptic number.

1221073854 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1221073854 is an abundant number, since it is smaller than the sum of its proper divisors (2057909826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1221073854 is a wasteful number, since it uses less digits than its factorization.

1221073854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203345.

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 1221073854 is about 34943.8671872476. The cubic root of 1221073854 is about 1068.8431477516.

The spelling of 1221073854 in words is "one billion, two hundred twenty-one million, seventy-three thousand, eight hundred fifty-four".