29742421 has 2 divisors, whose sum is σ = 29742422. Its totient is φ = 29742420.

The previous prime is 29742409. The next prime is 29742443. The reversal of 29742421 is 12424792.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27973521 + 1768900 = 5289^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 29742421 - 2⁵ = 29742389 is a prime.

It is a super-2 number, since 2×29742421² = 1769223213882482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29742481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14871210 + 14871211.

It is an arithmetic number, because the mean of its divisors is an integer number (14871211).

Almost surely, 2^29742421 is an apocalyptic number.

It is an amenable number.

29742421 is a deficient number, since it is larger than the sum of its proper divisors (1).

29742421 is an equidigital number, since it uses as much as digits as its factorization.

29742421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 29742421 is about 5453.6612472723. The cubic root of 29742421 is about 309.8314067665.

The spelling of 29742421 in words is "twenty-nine million, seven hundred forty-two thousand, four hundred twenty-one".