70615021221 has 6 divisors (see below), whose sum is σ = 101999475110. Its totient is φ = 47076680808.

The previous prime is 70615021187. The next prime is 70615021237. The reversal of 70615021221 is 12212051607.

70615021221 is a `hidden beast` number, since 7 + 0 + 615 + 0 + 21 + 2 + 21 = 666.

It can be written as a sum of positive squares in only one way, i.e., 70338996225 + 276024996 = 265215^2 + 16614^2 .

It is not a de Polignac number, because 70615021221 - 2⁶ = 70615021157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70615021921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3923056726 + ... + 3923056743.

Almost surely, 2^70615021221 is an apocalyptic number.

It is an amenable number.

70615021221 is a deficient number, since it is larger than the sum of its proper divisors (31384453889).

70615021221 is a wasteful number, since it uses less digits than its factorization.

70615021221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7846113475 (or 7846113472 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 70615021221 its reverse (12212051607), we get a palindrome (82827072828).

The spelling of 70615021221 in words is "seventy billion, six hundred fifteen million, twenty-one thousand, two hundred twenty-one".