121257406 has 4 divisors (see below), whose sum is σ = 181886112. Its totient is φ = 60628702.

The previous prime is 121257391. The next prime is 121257407. The reversal of 121257406 is 604752121.

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

It is a super-3 number, since 3×121257406³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121257407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30314350 + ... + 30314353.

It is an arithmetic number, because the mean of its divisors is an integer number (45471528).

Almost surely, 2^121257406 is an apocalyptic number.

121257406 is a deficient number, since it is larger than the sum of its proper divisors (60628706).

121257406 is an equidigital number, since it uses as much as digits as its factorization.

121257406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60628705.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 121257406 is about 11011.6940567744. The cubic root of 121257406 is about 494.9592266521.

The spelling of 121257406 in words is "one hundred twenty-one million, two hundred fifty-seven thousand, four hundred six".