21426131077 has 8 divisors (see below), whose sum is σ = 23162033664. Its totient is φ = 19702762608.

The previous prime is 21426131057. The next prime is 21426131093. The reversal of 21426131077 is 77013162412.

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 21426131077 - 2⁷ = 21426130949 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 (21426131047) 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, 3129973 + ... + 3136810.

It is an arithmetic number, because the mean of its divisors is an integer number (2895254208).

Almost surely, 2^21426131077 is an apocalyptic number.

It is an amenable number.

21426131077 is a deficient number, since it is larger than the sum of its proper divisors (1735902587).

21426131077 is a wasteful number, since it uses less digits than its factorization.

21426131077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6267059.

The product of its (nonzero) digits is 14112, while the sum is 34.

Adding to 21426131077 its reverse (77013162412), we get a palindrome (98439293489).

The spelling of 21426131077 in words is "twenty-one billion, four hundred twenty-six million, one hundred thirty-one thousand, seventy-seven".