1226407721 has 36 divisors (see below), whose sum is σ = 1581093360. Its totient is φ = 947746800.

The previous prime is 1226407681. The next prime is 1226407729. The reversal of 1226407721 is 1277046221.

It is not a de Polignac number, because 1226407721 - 2⁶ = 1226407657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1226407729) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 775910 + ... + 777488.

It is an arithmetic number, because the mean of its divisors is an integer number (43919260).

Almost surely, 2^1226407721 is an apocalyptic number.

1226407721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1226407721 is a deficient number, since it is larger than the sum of its proper divisors (354685639).

1226407721 is a wasteful number, since it uses less digits than its factorization.

1226407721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1746 (or 1728 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 1226407721 is about 35020.1045258292. The cubic root of 1226407721 is about 1070.3971859372.

The spelling of 1226407721 in words is "one billion, two hundred twenty-six million, four hundred seven thousand, seven hundred twenty-one".