1221025423351 has 16 divisors (see below), whose sum is σ = 1301815735200. Its totient is φ = 1141234677760.

The previous prime is 1221025423339. The next prime is 1221025423361. The reversal of 1221025423351 is 1533245201221.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1221025423351 - 2⁹ = 1221025422839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221025423301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11907240 + ... + 12009346.

It is an arithmetic number, because the mean of its divisors is an integer number (81363483450).

Almost surely, 2^{1221025423351} is an apocalyptic number.

1221025423351 is a deficient number, since it is larger than the sum of its proper divisors (80790311849).

1221025423351 is a wasteful number, since it uses less digits than its factorization.

1221025423351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106994.

The product of its (nonzero) digits is 14400, while the sum is 31.

The spelling of 1221025423351 in words is "one trillion, two hundred twenty-one billion, twenty-five million, four hundred twenty-three thousand, three hundred fifty-one".