1221024731 has 8 divisors (see below), whose sum is σ = 1264863600. Its totient is φ = 1177855360.

The previous prime is 1221024719. The next prime is 1221024743. The reversal of 1221024731 is 1374201221.

It is an interprime number because it is at equal distance from previous prime (1221024719) and next prime (1221024743).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1221024731 - 2²² = 1216830427 is a prime.

It is a super-2 number, since 2×1221024731² = 2981802787427244722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1221024697 and 1221024706.

It is not an unprimeable number, because it can be changed into a prime (1221024631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163661 + ... + 170958.

It is an arithmetic number, because the mean of its divisors is an integer number (158107950).

Almost surely, 2^1221024731 is an apocalyptic number.

1221024731 is a deficient number, since it is larger than the sum of its proper divisors (43838869).

1221024731 is an equidigital number, since it uses as much as digits as its factorization.

1221024731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334749.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1221024731 is about 34943.1642957532. The cubic root of 1221024731 is about 1068.8288146065.

Adding to 1221024731 its reverse (1374201221), we get a palindrome (2595225952).

The spelling of 1221024731 in words is "one billion, two hundred twenty-one million, twenty-four thousand, seven hundred thirty-one".