1221525401011 has 4 divisors (see below), whose sum is σ = 1230441644952. Its totient is φ = 1212609157072.

The previous prime is 1221525400993. The next prime is 1221525401021. The reversal of 1221525401011 is 1101045251221.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221525401011 - 2⁷ = 1221525400883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221525401021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4458121765 + ... + 4458122038.

It is an arithmetic number, because the mean of its divisors is an integer number (307610411238).

Almost surely, 2^{1221525401011} is an apocalyptic number.

1221525401011 is a deficient number, since it is larger than the sum of its proper divisors (8916243941).

1221525401011 is an equidigital number, since it uses as much as digits as its factorization.

1221525401011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8916243940.

The product of its (nonzero) digits is 800, while the sum is 25.

The spelling of 1221525401011 in words is "one trillion, two hundred twenty-one billion, five hundred twenty-five million, four hundred one thousand, eleven".