70081421 has 4 divisors (see below), whose sum is σ = 72342144. Its totient is φ = 67820700.

The previous prime is 70081411. The next prime is 70081447. The reversal of 70081421 is 12418007.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-70081421 is a prime.

It is a super-2 number, since 2×70081421² = 9822811138758482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70081411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1130315 + ... + 1130376.

It is an arithmetic number, because the mean of its divisors is an integer number (18085536).

Almost surely, 2^70081421 is an apocalyptic number.

It is an amenable number.

70081421 is a deficient number, since it is larger than the sum of its proper divisors (2260723).

70081421 is a wasteful number, since it uses less digits than its factorization.

70081421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2260722.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 70081421 is about 8371.4646866603. The cubic root of 70081421 is about 412.2882581483.

Adding to 70081421 its reverse (12418007), we get a palindrome (82499428).

The spelling of 70081421 in words is "seventy million, eighty-one thousand, four hundred twenty-one".