101221142461 has 4 divisors (see below), whose sum is σ = 103956849052. Its totient is φ = 98485435872.

The previous prime is 101221142459. The next prime is 101221142479. The reversal of 101221142461 is 164241122101.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55806975225 + 45414167236 = 236235^2 + 213106^2 .

It is a cyclic number.

It is not a de Polignac number, because 101221142461 - 2¹ = 101221142459 is a prime.

It is a super-2 number, since 2×101221142461² (a number of 23 digits) 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 (101221142761) 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, 1367853240 + ... + 1367853313.

It is an arithmetic number, because the mean of its divisors is an integer number (25989212263).

Almost surely, 2^101221142461 is an apocalyptic number.

It is an amenable number.

101221142461 is a deficient number, since it is larger than the sum of its proper divisors (2735706591).

101221142461 is an equidigital number, since it uses as much as digits as its factorization.

101221142461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2735706590.

The product of its (nonzero) digits is 768, while the sum is 25.

Adding to 101221142461 its reverse (164241122101), we get a palindrome (265462264562).

The spelling of 101221142461 in words is "one hundred one billion, two hundred twenty-one million, one hundred forty-two thousand, four hundred sixty-one".