1226847921 has 64 divisors (see below), whose sum is σ = 1869880320. Its totient is φ = 710519040.

The previous prime is 1226847907. The next prime is 1226847931. The reversal of 1226847921 is 1297486221.

It is not a de Polignac number, because 1226847921 - 2⁷ = 1226847793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1226847931) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6853810 + ... + 6853988.

It is an arithmetic number, because the mean of its divisors is an integer number (29216880).

Almost surely, 2^1226847921 is an apocalyptic number.

It is an amenable number.

1226847921 is a deficient number, since it is larger than the sum of its proper divisors (643032399).

1226847921 is a wasteful number, since it uses less digits than its factorization.

1226847921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366.

The product of its digits is 96768, while the sum is 42.

The square root of 1226847921 is about 35026.3889232105. The cubic root of 1226847921 is about 1070.5252380983.

The spelling of 1226847921 in words is "one billion, two hundred twenty-six million, eight hundred forty-seven thousand, nine hundred twenty-one".