1221953427492 has 96 divisors (see below), whose sum is σ = 3266330554368. Its totient is φ = 348296143104.

The previous prime is 1221953427473. The next prime is 1221953427503. The reversal of 1221953427492 is 2947243591221.

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, 61933333 + ... + 61953059.

It is an arithmetic number, because the mean of its divisors is an integer number (34024276608).

Almost surely, 2^{1221953427492} is an apocalyptic number.

1221953427492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1221953427492 is an abundant number, since it is smaller than the sum of its proper divisors (2044377126876).

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

1221953427492 is a wasteful number, since it uses less digits than its factorization.

1221953427492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21465 (or 21463 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 51.

The spelling of 1221953427492 in words is "one trillion, two hundred twenty-one billion, nine hundred fifty-three million, four hundred twenty-seven thousand, four hundred ninety-two".